John Tierney is the author of Willpower and writes the 'Findings' science column for the New York Times. His writing has won awards from the American Association for the Advancement of Science and the American Institute of Physics.

Roy F. Baumeister is the author of Willpower and a social psychologist who explores how we think about the self, and why we feel and act the way we do. He is especially known for his work on the subjects of willpower, self-control, and self-esteem, and how they relate to human morality and success.