Costis Maglaras is the David and Lyn Silfen Professor of Business at Columbia University, where he has been on the faculty of the Graduate School of Business in the division of Decision, Risk & Operations since 1998. His research focuses on stochastic networks, financial engineering, and quantitative pricing and revenue management. Some of his recent work has focused on: models and empirical analysis of high-frequency market microstructure; the design of portfolio trading systems and algorithms; the application of quantitative pricing and risk management in the residential real-estate market; and, the interface between social learning, social networks and questions regarding pricing, targeted marketing and information diffusion.