A.J. Jacobs is the author of the new book Drop Dead Healthy: One Man's Humble Quest for Bodily Perfection. His previous books include The Know-It-All (about his experience reading the entire Encyclopedia Britannica) and The Year of Living Biblically (about his year following all the rules of the Bible). He is the editor at large of Esquire magazine. He lives in New York with his wife and three sons.