Editor’s note: Dr. Williams is the author or co-author of a number of books. His most recently published book is Mindfulness-Based Cognitive Therapy for Depression, Second Edition (Guilford Press, 2013) which he wrote with John Teasdale and Zindel Segal. He is also a co-author of Mindfulness: A Practical Guide to Finding Peace in a Frantic World, which he wrote with Danny Penman (Rodale, New York and Piatkus, London, 2011) and The Mindful Way through Depression: Freeing Yourself from Chronic Unhappiness, which he wrote with Teasdale, Segal, and Jon Kabat-Zinn (Guilford Press, 2007).