Jay Koehler studies quantitative reasoning in the law, behavioral decision theory, and the psychology of investment. He holds the first, full joint faculty appointment in the law and business schools at ASU, and currently teaches the seminar, Probability & Science in Court, at the College of Law, and a Business Statistics course at the business school.

Prior to joining the College in 2007, Professor Koehler was a University Distinguished Teaching Professor in the McCombs School of Business at the University of Texas at Austin, where he was named the Outstanding Business Honors Program Professor on four occasions. Professor Koehler was a Searle Visiting Scholar at Northwestern University School of Law, a visiting scholar in the psychology departments at both Harvard University (in social cognition) and Stanford University and a visiting scholar at Stanford Law School (in psychology and law). He has conducted extensive research in the area of how jurors, attorneys and experts think about scientific and statistical evidence, and how investors make financial decisions.

Professor Koehler has served as an expert witness on statistical evidence in many cases and was a consultant for the defense in the criminal trial of O.J. Simpson.