Harry Mamaysky is a Professor of Professional Practice at Columbia Business School, and the director of the News and Finance research initiative at the Business School’s Program for Financial Studies. He was formerly head of the Systemic Risk Group at Citigroup and a member of the firm’s Risk Executive Committee. Previous to that, he was senior portfolio manager in Citi Principal Strategies, where he co-managed the relative value credit book. Before joining Citigroup, he held positions with Old Lane, Morgan Stanley, and Citicorp. He was also an assistant professor of finance at the Yale School of Management during the period 2000–02.

His research interests are in asset pricing, market frictions, and the role of information in financial markets. His research has appeared in leading academic journals, and he has presented at numerous academic and professional conferences. Mamaysky earned his PhD in finance from the Massachusetts Institute of Technology under the supervision of Jiang Wang and Andrew Lo. He also holds a BA in economics as well as BS and MS degrees in computer science from Brown University.