Mack Robinson College of Business, Georgia State University. Koray is a quantitative modeler. In his research, he develops econometric models to study firm and consumer decisions in order to gain substantive marketing insights. He uses a variety of methods such as dynamic programming, computational game theory, choice, count, hazard, diffusion, hidden Markov, and Copula models. His research has been published at top-tier marketing and business journals such as Marketing Science, Management Science and Journal of Marketing Research.