Stefano DellaVigna is the Daniel E. Koshland, Sr. Distinguished Professor of Economics and Professor of Business Administration at the University of California, Berkeley. His early work pioneered, both theoretically and empirically, investigations of the impact of behavioral biases on market outcomes. His most recent work uses novel and carefully constructed techniques to learn about such difficult and important topics as the motives for voting and charitable giving. In between, he has done important work on such topics as the impact of partisan media coverage on voting, the effect of fast food restaurants on obesity, departures of asset prices from fundamentals, illegal arms sales, and more.