In his 2012 book Why Does the World Exist?: An Existential Detective Story, Jim Holt creates a narrative out of one of the biggest questions we can ask -- and how modern scientists and philosophers are asking it. Can answers be found in many-worlds theory, in quantum mechanics, in a theology? Traveling around North America and Europe, he talks to physicists, including David Deutsch; philosophers, including Richard Swinburne; and the novelist John Updike. Why? Because as he tells Vanity Fair, "To me it’s the most sublime and awesome question in all of philosophy and all of human inquiry."

A longtime contributor to the New York Times, Slate and the New Yorker, Holt has written on string theory, time, infinity, numbers, humor, logic, truth and bullshit, among other topics. Holt studied mathematics at the University of Virginia, and was a faculty fellow in the philosophy department at Columbia. He is now at work on a book about free will, weakness of will, self-knowledge and happiness.