Richard H. Thaler is an American economist. He is perhaps best known as a theorist in behavioral finance, and for his collaboration with Daniel Kahneman and others in further defining that field.

He currently teaches at the University of Chicago Booth School of Business, and is an associate at the National Bureau of Economic Research, and has organized a series of behavioral finance seminars along with Robert Shiller, another behavioral finance expert at the Yale School of Management. Previously he taught at Cornell University and the MIT Sloan School of Management

Thaler has written a number of books intended for a lay reader on the subject of behavioral finance, including "Quasi-rational Economics" and "The Winner's Curse," the latter of which contains many of his Anomalies columns revised and adapted for a popular audience.

Most recently Thaler is coauthor, with Cass R. Sunstein, of "Nudge: Improving Decisions About Health, Wealth, and Happiness" (Yale University Press, 2008).