Michael Monroe Lewis is an American author and financial journalist. He has also been a contributing editor to Vanity Fair since 2009, writing mostly on business, finance, and economics. He is renowned for his nonfiction work, particularly his coverage of financial crises and behavioral finance.

Lewis was born in New Orleans and attended Princeton University, where he graduated with a degree in art history. He furthered his education at the London School of Economics. In the 1980s, he began his career on Wall Street as a bond salesman at Salomon Brothers, an experience that inspired his first book, Liar's Poker (1989).

Fourteen years later, Lewis gained significant attention with Moneyball: The Art of Winning an Unfair Game (2003), investigating the success of the Oakland Athletics baseball team and their general manager Billy Beane. His book The Blind Side: Evolution of a Game (2006) was his first to be adapted into a film, followed by the release of The Big Short in 2010, which was adapted into a movie in 2015.

His works have won two Los Angeles Times Book Prizes, and several have reached number one on The New York Times Best Seller list, including his most recent book, Going Infinite (2023).