Michael Lewis, the author of Moneyball and The Big Short, examines the remarkable collaboration between Israeli psychologists Daniel Kahneman and Amos Tversky, which made much of his own work possible. In his latest book, The Undoing Project: A Friendship that Changed Our Minds, he looks at how they created the field of behavioral economics, revolutionized big data studies and government regulatory practices, and changed the way we think about making high-risk decisions.