**Roy Kouwenberg is a visiting researcher at the Department of Business Economics, at the Erasmus School of Economics (ESE). He is Associate Professor and Chair of the Ph.D. Program at Mahidol University in Bangkok.** His research focuses on portfolio choice in a behavioural framework, especially the impact of loss aversion and ambiguity aversion on stock market participation. He collaborates in this area with Peter Wakker (Erasmus, ESE), Steve Dimmock (Nanyang Technological University, Singapore), Kim Peijnenburg (Bocconi, Milan), Oliva Mitchell (Wharton School, U of Pennsylvania), Xuedong He (Columbia University), Xunyu Zhou (Oxford University) and Remco Zwinkels (VU University, Amsterdam). Roy's work has been published in the *Journal of Financial Economics, Management Science,* the *Journal of Financial and Quantitative Analysis* and the *Review of Economics & Statistics*, among others. Roy has work experience as a quantitative analyst at AEGON Asset Management and has done extensive research on risk management for financial institutions. He is a CFA charterholder (Chartered Financial Analyst). Roy received his Ph.D. from Erasmus University Rotterdam in 2000.