John Kaag is the author of American Philosophy: A Love Story, which was named a New York Times Editors' Choice and an NPR Best Book of the year, and Hiking with Nietzsche: On Becoming Who You Are, which was also an NPR Best Book of the year. His writing has appeared in the New York Times, Harper's Magazine, and many other publications. He is professor of philosophy at the University of Massachusetts, Lowell, and lives in Carlisle, Massachusetts. Twitter @JohnKaag