Justin Fox is editorial director of the Harvard Business Review Group and senior fellow at the Mossavar-Rahmani Center for Business and Government at Harvard Kennedy School. He is the author of The Myth of the Rational Market: A History of Risk, Reward, and Delusion on Wall Street, a New York Times bestseller and Notable Book of 2009. Before joining HBR Group in 2010, he wrote a weekly column for Time and created the Curious Capitalist blog for Time.com. Previously, Fox spent more than a decade as a writer and editor at Fortune magazine. He blogs at hbr.org, and is on Twitter at @foxjust.