Gautam Gowrisankaran is an expert in industrial organization, healthcare economics, and energy and environmental economics. Professor Gowrisankaran has analyzed issues of market definition and market power, the competitive effects of mergers, and claims of attempted monopolization. He has also addressed allegations of tying, foreclosure, and other exclusionary practices arising in such industries as healthcare, consumer goods, high-tech products, payment services, and transportation.Prior to joining the faculty at Columbia, Professor Gowrisankaran was a tenured professor of economics and the Peter and Nancy Salter Chair in Healthcare Management at the University of Arizona. He has held visiting academic appointments at Northwestern University, the University of Chicago, Yale University, and Harvard University, among others.