Cristopher Moore and John Kaag  are occasional collaborators. Cristopher Moore is a professor at the Santa Fe Institute, coauthor of The Nature of Computation, and a fellow of the American Mathematical Society, the American Physical Society, and the American Association for the Advancement of Science. John Kaag is a professor of philosophy at the University of Massachusetts at Lowell, a Miller Scholar at the Santa Fe Institute, and author of Hiking with Nietzsche: On Becoming Who You Are and Sick Soul, Healthy Minds: How William James Can Save Your Life.