 His most recent book, Discrete Choice Methods with Simulation, deals with a new area in econometrics.His software for mixed logit estimation, which is distributed free on his university website, has been used by researchers worldwide, and several commercial statistical packages have recently added mixed logit routines that reach an even larger audience.Professor Train has served as an expert witness in court cases and regulatory proceedings, on the editorial board of academic journals, and as chair of the Center for Regulatory Policy at UC Berkeley.