A.J. Jacobs is a human guinea pig and the author of four New York Times bestsellers.

Jacobs is the editor at large of Esquire magazine. He is a correspondent for Upwave health and fitness. He has also written for The New York Times, Entertainment Weekly, New York magazine and Dental Economics magazine, one of the top five magazines about the financial side of tooth care. He has appeared on Oprah, The Today Show, Good Morning America. He is a periodic commentator on NPR’s Weekend Edition Saturday, where he discusses important trivia.