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

Lewis was born in New Orleans and attended Princeton University, graduating with a degree in art history. Following his time at the London School of Economics, he embarked on a career on Wall Street during the 1980s as a bond salesman at Salomon Brothers. This experience inspired his first book, Liar's Poker (1989). He later wrote Moneyball: The Art of Winning an Unfair Game (2003), analyzing the success of the Oakland Athletics baseball team and their general manager, Billy Beane.

His 2006 book, The Blind Side: Evolution of a Game, was the first of his works adapted into a film, The Blind Side (2009). In 2010, he published The Big Short: Inside the Doomsday Machine, which was also adapted into a film. Several of his books, including his most recent, Going Infinite (2023), have reached number one on the New York Times Best Seller list.