Mark Williams is Associate Professor of Global Medieval Literature at the University of Oxford and the author of Ireland's Immortals: A History of the Gods of Irish Myth. He writes with 'extraordinary erudition and devastating wit' (New York Review of Books).

Jon Kabat-Zinn, PhD, is founding Executive Director of the Center for Mindfulness in Medicine, Health Care, and Society at the University of Massachusetts Medical School. He is also the founding director of its renowned Stress Reduction Clinic and Professor of Medicine emeritus at the University of Massachusetts Medical School.

He teaches mindfulness and Mindfulness-Based Stress Reduction (MBSR) in various venues around the world. He received his Ph.D. in molecular biology from MIT in 1971 in the laboratory of Nobel Laureate, Salvador Luria.

He is the author of numerous bestselling books about mindfulness and meditation. Overall, his books have been translated into over 30 languages.