“Being a nice person is about courtesy: you're friendly, polite, agreeable, and accommodating. When people believe they have to be nice in order to give, they fail to set boundaries, rarely say no, and become pushovers, letting others walk all over them.”

American popular science author and professor of organizational psychology

Adam M. Grant is an American popular science author and professor of organizational psychology at the Wharton School of the University of Pennsylvania. He is known for writing about work, motivation, and how people and organizations can improve performance and make better decisions. His writing draws on organizational psychology and is aimed at a broad audience, which has made him a familiar name in contemporary popular nonfiction.