|
Trading as Mental
Warfare
By Brett N. Steenbarger, Ph.D.
Writings on the psychology of trading commonly
view emotional conflicts and reaction patterns as impediments to
successful trading. Accordingly, they advocate various therapeutic
and self-improvement exercises to remove these obstacles. In this
article, I propose a very different perspective: trading as a
military activity, rather than a psychological one. Specifically, I
will draw upon the military writings of Col. John R. Boyd to
demonstrate that successful trading requires superior strategic
prowess. As we shall see, this implies that one’s growth as a trader
may be more fruitfully pursued through systematic “combat” training
than through traditional self-help exercises. This military
framework forms the conceptual foundation for a research project
already under way, in which researchers from the Massachusetts
Institute of Technology (Andrew Lo and Dmitry Repin) are working
with a successful trader (Linda Bradford Raschke) and a clinical
psychologist (Brett Steenbarger) to explore the effects of emotions
and training on the real-time trading results of over 100 traders.
Epistemology: How We Know What We Know
While Col. Boyd is most identified with his OODA (observe, orient,
decide, act) framework for decision making in combat, the breadth of
his work extended well into philosophy. Boyd was interested in
epistemology: the study of knowledge and its acquisition. In this
respect, his interests—and his thinking—parallel those of Swiss
researcher Jean Piaget. An understanding of Boyd and Piaget’s work
will prove helpful in grasping the mind of the trader.
Boyd described the generation of knowledge and understanding as a
process of creation and destruction. As David S. Fadok explains in
his excellent thesis entitled John Boyd and John Warden: Air Power’s
Quest for Strategic Paralysis, Boyd equated creation with synthesis
and destruction with analysis. In the face of changing realities and
new information, people create fresh “mental images” of the world.
They analyze new events and information and synthesize these into
updated perspectives. In conditions of war, this facilitates
adaptation to the uncertainties of battle. Quoting Boyd, Fadok
explains that adaptation in wartime requires mental agility: "a
process of reaching across many perspectives; pulling each and every
one apart (analysis), all the while intuitively looking for those
parts of the disassembled perspectives which naturally interconnect
with one another to form a higher order, more general elaboration
(synthesis) of what is taking place."
Students of psychology will find echoes of Jean Piaget’s writings in
Boyd’s theory of knowledge. Both men are constructivists: they
emphasize the processes by which we assemble our understandings of
self and others. In place of creation (synthesis) and destruction
(analysis), Piaget referred to assimilation and accommodation. These
he viewed as twin forces that allow individuals to maintain a
dynamic equilibrium of knowledge. What Boyd refers to as mental
images, Piaget calls schemas. These are mental maps that we
construct that aid us in navigating reality. When we encounter
events that do not neatly fit within our schemas, we try to
reinterpret those events and assimilate them to our current mental
maps. If such efforts at assimilation fail, we are forced to
accommodate to the new reality and revise our schemas.
In his comprehensive book The Developmental Psychology of Jean
Piaget, John Flavell summarizes a perspective that could be equally
applied to Boyd: “The subject is construed to be an ever organized
entity which accommodates its schemas (the basic units of this
organization) to external reality as it assimilates the reality to
the schemas.” This ensures that knowledge becomes increasingly
organized and complex, as it must account for an increasing body of
life experience.
Boyd emphasized that this complexity is a precondition of survival,
in life and in war. In his well known presentation, Patterns of
Conflict, Boyd explained, “It is advantageous to possess a variety
of responses that can be applied rapidly to gain sustenance, avoid
danger, and diminish [the] adversary’s capacity for independent
action…To shape and adapt to change one cannot be passive; instead
one must take the initiative.” In other words, the accuracy and the
speed with which individuals can revise their mental maps in the
face of new realities will facilitate their survival. This simple
principle forms the basis for a new perspective on the psychology of
trading.
Speed of Processing: The Crucial Variable
Col. Boyd was a fighter pilot and chose aerial combat as the “point
of departure” for his military theory. He was renowned for his
challenge that he could place his plane in a position of
disadvantage relative to any pursuer and outmaneuver the pursuer for
strategic advantage within 40 seconds. Boyd never had to eat those
words, and thus earned the nickname “Forty second Boyd.” He
attributed his success to his ability to outthink his adversary. By
making unexpected maneuvers at opportune moments, he left his
pursuer temporarily confused, opening a window of vulnerability—and
opportunity.
Boyd referred to these maneuvers as “fast transients”—rapid,
unexpected actions that violate the mental images (schemas) of the
enemy. In Patterns of Conflict, he notes that the “idea of fast
transients suggests that, in order to win, we should operate at a
faster tempo or rhythm than our adversaries.” Echoing Sun Tzu, he
further explains, “Such activity will make us appear ambiguous
(unpredictable) [and] thereby generate confusion and disorder among
our adversaries—since our adversaries will be unable to generate
mental images or pictures that agree with the menacing as well as
faster transient rhythm or patterns they are competing against.”
Victory in war, Boyd believed, was primarily a
mental victory. By confusing and surprising the enemy, we wear down
his ability to comprehend, adapt, and resist. Fadok explains, “The
aim of Boyd's maneuver warfare is to render the enemy powerless by
denying him the time to mentally cope with the rapidly unfolding,
and naturally uncertain, circumstances of war. One's military
operations aim to 1) create and perpetuate a highly fluid and
menacing state of affairs for the enemy, and 2) disrupt or
incapacitate his ability to adapt to such an environment.”
The winner in conflict is the one who is able to
operate within the mental images (schemas) of the adversary. Once
you know your enemy’s mental maps, you can select opportunities to
operate outside the rules and expectations of those maps, creating
temporary disorientation. While the enemy is struggling to
assimilate your new actions and accommodate to them, a window of
vulnerability opens. This is a lightning process, requiring rapid
judgment and action, as in the case of a 40 second dogfight.
The goal of such fast transient maneuvers, Boyd
wrote, is to “enmesh [the] adversary in an amorphous, menacing, and
unpredictable world of uncertainty, doubt, mistrust, confusion,
disorder, fear, panic, chaos,…and/or fold [the] adversary back
inside himself.” This latter point is crucial. When the enemy is
disoriented, he must “fold back inside himself” to adjust his
thinking and redraw his maps. While he is so engrossed, he is
unlikely to be able to keep up with the rapidly shifting realities
of battle. Fadok quotes the essence of Boyd’s thinking: “You must
get into the mind of humans. That's where the battles are won.”
One can find many examples of Boyd’s principles
in competitive sports and games. The successful chess player stays
one or more moves ahead of his adversary, using surprise moves to
break the opponent’s strategy and create demoralization. The
champion heavyweight Muhammad Ali repeatedly used psychological
warfare to surprise and disorient his opponents. When he found out
Sonny Liston had a fear of insane criminals during his
incarceration, Ali (then fighting as Cassius Clay) purposely acted
crazy in the pre-fight weigh-in, yelling and banging a walking
stick. Liston declined to continue the fight after the seventh
round, as much demoralized as battered.
Later, Ali accomplished a similar outcome against
George Foreman in Zaire, during the famous “Rumble in the Jungle”.
Refusing to dance around the ring, Ali allowed the larger Foreman to
pummel him and wear himself out. All the while, Ali taunted him: “Is
that all you got? You hit like a sissy!” Worn out and discouraged,
Foreman fell prey to an Ali right hand and couldn’t respond to the
ten count.
“Diminish [the] adversary’s capacity while
improving our capacity to adapt as an organic whole,” Boyd advised,
“so that our adversary cannot cope while we can cope with
events/efforts as they unfold.” By seizing the initiative and
operating outside the schemas of the adversary, we create strategic
advantage.
The OODA Loop
Suppose we, as traders, wish to duplicate the fast transient
maneuverability of Col. Boyd and become “forty second traders”. How
might we operate?
First we would go to our trade stations and
observe what the market is doing. Is it rising, falling, or
consolidating? Is volatility increasing or waning?
Second, we would orient ourselves by placing the
market’s present action into context. Is the current day’s activity
occurring within a larger trend or within a broader trading range?
Are various market sectors moving in concert, or are there
discrepancies? What is the movement of interest rates, overseas
markets, and commodities?
Third, we would decide upon a course of action
once we had integrated the market’s current action with the broader
context of trading and economic forces. Our decision would be based
upon the mental image of the situation we had created, such as a
topping market gaining downside momentum in a rising interest rate
environment.
Finally, once we had arrived at a trading
decision, we would need to act and place orders based upon our
mental maps. Our actions would reflect our judgments as to relative
value in the market—where the market is properly valued for a
purchase or sale—as well as our assessment of the proportion of
assets to be devoted to the trade.
This four-part sequence of OODA—observe, orient,
decide, and act—lies at the heart of Col. Boyd’s theory of military
strategy. Our continuous process of mental map building allows us to
make sense of our observations, orient ourselves in conditions of
danger, and take action based upon decisions that reflect updated
realities. The tactical goal of war, Boyd emphasized, is to
“observe-orient-decide-act more inconspicuously, more quickly, and
with more irregularity…to repeatedly and unexpectedly penetrate
vulnerabilities and weaknesses exposed by that effort.”
Boyd describes OODA as a loop, not as a linear
sequence. Our decisions and actions generate new observations that
require renewed orientation and fresh decisions. The advantage in
battle goes to the side that operates with the most rapid loops,
adapting to changing conditions before the enemy, thereby opening
windows of confusion and chaos that can be exploited.
The grand tactic of war, Boyd stressed, is to
“operate inside adversary’s observation-orientation-decision-action
loops or get inside his mind-time-space.” The most fundamental
attack strategy, from this perspective, is the attack on the enemy’s
mind: an assault on his ability to process information and know
reality. When we operate within the enemy’s OODA loops, we can
“penetrate [the] adversary’s moral-mental-physical being to dissolve
his moral fiber, disorient his mental images, disrupt his
operations, and overload his system.”
The key to operating within the enemy’s cognitive
loops is the use of surprise and unpredictability. Remember that it
was the sudden, unexpected, extreme maneuver that allowed Boyd to
evade his pursuer in aerial combat and plant himself on the
pursuer’s tail. “War is the province of uncertainty;” German
military theorist Karl von Clausewitz observed, “three-fourths of
the things on which action in war is based lie hidden in the fog of
uncertainty.” Strategy, for Boyd, is the art of increasing and
exploiting this uncertainty. In this, he is preceded by
Napoleon—“The battlefield is a scene of constant chaos. The winner
will be the one who controls that chaos, both his own and the
enemy’s.”—and by Sun Tzu: “What is of supreme importance in war is
to attack the enemy’s strategy.”
All warfare, for Boyd, is psychological warfare.
From this premise, we can characterize the victor in battle: active,
confident, planful, and orderly. We can also characterize the loser
in any battle: reactive, demoralized, confused, and disorganized.
The goal of combat is not merely to defeat the enemy through sheer
force, but to defeat his will to resist. This is a marked departure
from the school of thought derived from Henri Joumini, which
declared the mass deployment of forces as the central tactic of
warfare. Leading a battle, Boyd would be more likely to follow
Rommel’s Blitzkriek than the frontal attacks of General Lee.
Trading as Mental Warfare
The preceding exposition of Boyd’s ideas, from epistemology to
strategy, provides a foundation from which we can understand the
challenge of trading the financial markets. Like the battlefield,
trading offers an environment typified by risk, danger, and
uncertainty. Trading also occurs in an environment that rewards the
efficiency of mental processing. The successful trader is one who
can rapidly observe market conditions, orient himself, integrate
information into effective decisions, and quickly act upon those
decisions. Indeed, a floor trader may need to operate with OODA
loops that are tighter than even those of forty second Boyd!
Who, however, is the enemy in trading? To a
certain degree, the adversary consists of other traders operating in
the same markets. The futures markets are a zero sum game and, if
one is to experience consistent success, it must be at the expense
of other participants. The trader who watches volume pick up at a
false breakout or late in a rise or decline is using that
information to enter the OODA loops of other traders and can craft
strategies that exploit that information. Knowing where the average
trader is likely to place stops, for example, permits the
experienced trader to enter the market just before these are hit,
capitalizing upon the miniature panic of liquidation. Larger traders
may even issue their own disinformation, masking their intentions to
buy or sell or leaking misleading information to draw in the bulls
or bears. Trading, in this context, is a chess game, with each
player pitted against others in an ongoing series of moves and
countermoves.
Boyd’s ideas, however, raise a more intriguing
possibility, in which the adversary in trading is the market itself.
When you are trading the S&Ps, you are not merely trying to enter
the OODA loop of rookie trader Joe Blow; you want to enter the
market’s loop as well. Like an enemy in wartime, the market masks
its intentions with false moves, quick thrusts, and lengthy periods
of inaction. In executing its function of efficiently allocating
resources to enterprise and rewarding the prudent assumption of
risk, the market must adapt to the trading patterns of the majority
and, indeed, must frustrate these patterns. Capital markets would
cease to function if, over the long haul, they failed to reward the
assumption of risk. Once the herd identifies a pattern within the
market, following this pattern becomes the safest course of
action—the path with least risk. This must, over time, be punished.
It is this tension between the risk aversion of
the majority and the need for rewards to disproportionately accrue
to risk takers that makes an adversary of the market. We see this in
numerous studies of mean reversion in the markets: high volume
stocks that have outperformed the market tend to underperform the
market over a period of years; low volume winning stocks tend to
outperform. Losing stocks tend to rebound and offer superior returns
compared to winning stocks. The market is prone to rise when a weak
open follows two or more days of decline and is prone to decline
when huge buying interest, measured by the NYSE TICK, fails to move
price significantly higher. “If it is obvious,” market guru Joseph
Granville used to say, “it is obviously wrong.” The successful
trader cannot merely follow the market, but must outwit it. He must
figure out what the market is doing and act before the market has
completed its move. This is what it means to operate within the
market’s OODA loop. Once the trader figures out how the market will
punish risk aversion and reward risk assumption, he has tightened
his own loop and now can outmaneuver the market.
Conversely, when the trader falls for the
market’s feints and parries, he enters a realm where the market now
operates within his OODA loop. The market is shifting tactics faster
than the trader can observe, orient, decide, and act, creating chaos
and eventual demoralization. An important market corollary of Boyd’s
work is that fear and greed are not primary emotions in trading.
Rather, the psychologically minded trader should look for the
appearance of certainty versus confusion. Before a trader will fall
prey to anxiety or depression, he will be confused. He will fail to
update his mental images to account for shifting market realities.
By the time he has reoriented and formulated a new course of action,
the market has made its move, leaving him in the red. Only then will
the emotions of fear and recrimination enter the picture. Left with
demoralization, the trader may conclude that his emotions are his
enemies. Nothing, however, could be further from the truth.
In reality, the trader’s emotions have given
useful and meaningful signals. The calm feeling of certainty known
to every experienced trader and sometimes referred to as “the zone”
suggests that the trader is operating within the market’s OODA loop.
Conversely, confusion and disorientation are sure indications that
the market has invaded the trader’s loop. Von Clausewitz stressed
that defense was the essence of every war. Similarly, the decision
to avoid trading during periods of confusion may be the trader’s
greatest weapon. Knowing when to fight is every bit as much a
tactical advantage as knowing how to fight.
From the perspective of Boyd’s military strategy,
the primary objective of trading psychology is not to overcome
emotion, but to create conditions conducive to “the zone” of
certainty and antithetical to confusion. No therapy or self-help
psychology can accomplish this; not in trading and not in war.
Certainty can only be achieved through experience and superior
training. No amount of positive thinking, visualizations, or any of
a myriad of self-help methods can substitute for the experience of
having observed and oriented oneself under a variety of market
conditions. “Untutored courage is useless in the face of educated
bullets,” General Patton observed. The market fires far too many
educated bullets to allow untutored traders to survive on the
financial battlefield.
Training for Trading
Speed, speed, speed is of the essence in war and in trading. “Don’t
delay,” Patton advised, “The best is the enemy of the good. By this
I mean that a good plan violently executed now is better than a
perfect plan next week.” Greatness in war has always required
boldness and the ability to strike quickly. “L’audace, l’audace,
toujours l’audace,” Napoleon exclaimed. While impulsivity may have
its costs, indecision is a greater threat. “It is better to act
quickly and err,” von Clausewitz explains, “than to hesitate until
the time of action is past.”
Speed is one element that distinguishes the
trader from the investor. The investor has time to weigh alternate
courses of action, research these, and implement them; portfolios
may be adjusted a few times per year if even that. Traders, however,
may place many trades within a day, or even an hour. The floor
trader has no time to conduct historical research, consult multiple
charts, or read research reports. His OODA loop has been so
tightened that it now operates at speeds beyond that of explicit
thought.
This creates an interesting psychological
dilemma. The rapid trader is like the baseball hitter facing a 95
mile per hour fast ball. While he may enter the situation with a
strategic aim—to bunt, hit to the opposite field, protect the
plate—he has no time to consciously observe, orient, decide, and act
as each pitch arrives. His OODA loop is implicit, rather than
explicit, drawing upon years of experience watching the release of
the pitcher, the rotation of the ball, the location of the pitch,
etc. Indeed, any attempt to formulate an explicit strategy is apt to
interfere with the batter’s normal swing. Like a Zen archer, the
batter must perform his actions naturally, without the interference
of the conscious mind.
The pitcher, on the other hand, does not want the
batter in “the zone”. He wants to disrupt the batter’s rhythm,
create uncertainty, and—in Boyd’s words—fold the adversary into
himself. A pitch thrown too closely inside will create disruption,
encouraging the batter to think of his safety instead of the next
pitch. A fastball down the pike on an 0 and 2 pitch similarly
attacks the hitter’s expectations by violating the normal
expectation of attempting to get the batter to swing at a pitch
outside the strike zone to avoid a strikeout. The duel between
pitcher and batter is an effort to outthink the opponent and enter
his loops. The pitcher wins if he can make the batter think—if his
disruptions and fast transient maneuvers force the batter out of the
implicit processing of “the zone”.
Similarly, the market wins most battles in which the short-term
trader no longer functions automatically. Traders frequently ask me
how they can sustain more positive thinking during their trades. My
response is that they shouldn’t be thinking during the trade at all.
If they are thinking, the market is almost surely inside their
loops. Consider the example of driving. Under ideal conditions, you
are not thinking about your driving. You may be listening to music,
carrying on conversations, or daydreaming while performing the
driving automatically. If you have to be thinking about the driving,
it is because some hazardous road, vehicle, or weather conditions
have arisen, or because you have become lost. At those points, you
are adapting to an abnormal reality. Your exiting the loop of the
automatic and entering into explicit thought suggests that you are
no longer fully in control.
The trader should no more be performing positive
thinking exercises than the batter or driver. The goal is to make
trading automatic: to so tighten the OODA loop that it is no longer
consciously driven. Clearly this can only be accomplished through
training. Repetition and exposure—constant drilling—are needed to
make learning automatic. In wartime, soldiers perform heroic actions
not so much because they lack fear but because they are trained to
do the right things under pressure. “Men are seldom born brave but
they acquire courage through training and discipline,” the Roman
military strategist Vegetius observed. “A handful of men inured to
war proceed to certain victory; while on the contrary numerous
armies of raw and undisciplined troops are but multitudes of men
dragged to the slaughter.”
A careful inspection of training methods in sports, law enforcement,
and the military suggests that superior performance is cultivated
through intensive drilling under simulated conditions that mirror
the risk and danger of real-world challenges. Soldiers, astronauts,
and chess players are pushed by their mentors to face what-if
scenarios that violate normal expectations. Only then can they
develop the proper mental pictures that will orient them and guide
their actions under threat. Facing these scenarios repeatedly
tightens the loops and allows for rapid execution of decisions.
Socrates was right when he said, “We are what we repeatedly do.
Excellence, then, is a habit.”
The goal of trading psychology is not to create
favorable states of mind. Rather, the goal is to create winning
habits: to so prepare the trader for any scenario that he will
remain inside the market’s loops even during periods of abnormal
trending and volatility.
How Can We Train Superior Traders?
“There is nothing so practical as a good theory,” psychologist Kurt
Lewin pointed out, and here is where we can observe the practical
implications of Boyd’s work. To cultivate decision making within a
40 second loop, traders must train like fighter pilots. They must
learn to think and react rapidly in the face of enemy maneuvers. The
adversary is attempting to enter their mind-time-space; only
superior information and processing of that information can prevent
this from happening.
Below are several practical directions for the training of traders:
The creation of multiple what-if scenarios during the trading day -
Napoleon advised, “A general-in-chief should ask himself several
times in the day, ‘What if the enemy were to appear now in my front,
or on my right, or my left?’” By expecting the unexpected, we can
create proper schemas for guiding our decisions and actions, taking
the advantage of surprise away from the adversary.
Intensive drilling under practice conditions – Nearest neighbor
statistical methods are techniques that allow one to identify past
markets that are similar to the current market on one or more
dimensions. For instance, if today’s market is up in the morning
after having risen yesterday afternoon from a five day low, I can
query my database for all such days matching this pattern. By paper
trading these similar days, I orient myself to the many market
maneuvers that can occur under present conditions. The goal is not
to predict what the market will do (the typical use of the nearest
neighbor methodology), but to identify what the market has done, so
that adaptive plans can be formulated for all contingencies.
Rapid drilling under practice conditions – A soldier trained in
survival may be deposited into unfamiliar terrain and then observed
to see how well he copes. Rapid observation, orientation, decision,
and action is needed so that the soldier will not fall victim to
hostile environmental conditions, predators, or enemy action.
Similarly, the trader can deposit himself in an unfamiliar market
drawn from a historical database and rapidly execute trades. Like
Boyd, the trader could issue challenges to the market: put me in a
position of disadvantage and I will execute a winning trade within
40 seconds. While beginning traders will no doubt require more than
40 seconds to execute their loops, gradually tightening the time
parameters will greatly facilitate the automatization of trading.
Intensive mentoring – While we all admire self-made individuals, the
reality is that superior athletes, soldiers, and traders are not
created out of thin air. They are the product of years of training
and mentoring. Wherever we see superior performance, it is the
result of day in and day out teaching, drilling, and practicing.
Traders often hope to learn their craft in seminars or through
books. They are no more likely to succeed in this hope than concert
pianists, chess players, armies, or Olympic athletes. It is the
intensity of instruction that facilitates its internalization to the
point at which learning is automatic and implicit. Indeed, it would
not be inaccurate to say that the entire purpose of training is to
allow individuals to acquire the mental maps of their mentors so
that they can eventually build upon these.
This three elements, then, form the core of
training successful traders:
Education – Teaching traders what to look for under different
market conditions.
Drilling – Performing regular exercises to build specific
skills.
Practice – Rehearsing trading under realistic conditions to
assemble the skills into superior performance.
Based upon Boyd’s work, I hypothesize that the
intensive enactment of these three elements yields expertise by
improving both the accuracy and the speed of one’s mental
processing, generating a richer array of mental images of the
market, and a wider range of response patterns for each image. At a
psychological level, I hypothesize that the hallmark of successful
trading is the reduction of the amount of time in which traders feel
confused, surprised, or otherwise disoriented and an increase of the
amount of time in which they feel confident, in control, and
otherwise familiar with the market terrain.
These are testable hypotheses, and we may get a
first test of them in research recently undertaken by Linda Bradford
Raschke and a team of investigators from the Massachusetts Institute
of Technology’s Sloan School of Management. Led by Andrew Lo, Ph.D.
and Dmitry Repin, Ph.D., this team will assist Linda and myself in
evaluating the emotional functioning and trading performance of over
100 frequent traders. Moreover, the study will specifically
investigate the emotional and trading impact of one month of
intensive education, drilling, and practice led by Ms. Raschke, an
accomplished mentor. For the first time, we will be able to put
Boyd’s ideas to work in a real time trading framework and see if
expertise can be cultivated in the markets, as it is on the
battlefield.
While one month is hardly enough time to generate
mastery in any complex domain, it should be enough time to permit an
internalization of basic skills, a developing sense of mastery, and
improvement in trading results. We will report on the outcomes of
this study in a future article and hope that it will raise as many
fruitful questions as it answers: What training methods work best,
and do certain methods work best for particular types of trading or
traders? Does the intensity of practice and exposure accelerate the
development of expertise? Is real time exposure to trading hazards
necessary to the expansion of one’s OODA loops or can realistic
simulations accomplish this purpose?
We have just begun to scratch the surface of understanding the
elements that contribute to trading excellence. Viewing trading as
mental warfare opens the door to the study of all warfare and the
moral elements that contribute to successful campaigns. Von
Clausewitz once observed that war is filled with frictions: chance
episodes that introduce uncertainty and doubt into the best-laid
plans. “Is there any lubricant that will reduce this abrasion?” he
asked. “Only one,” was his answer. “Combat experience.”

 |
Brett N. Steenbarger, Ph.D. is a clinical
psychologist and active trader, writer, and
researcher for the past 20 years, Brett is the
author of The Psychology of Trading (Wiley;
2003) and numerous articles on trading psychology
for print and online financial publications.
Click here for full
bio >>
|
|