Bernie Clark author of the best selling The Complete Guide to Yin Yoga, has had a passion for science, health, sports and spirituality since childhood. He has a degree in science from the University of Waterloo and spent over 25 years as a senior executive in the high-tech/space industry. Bernie has been investigating the path of meditation for over three decades and began teaching yoga and meditation in 1998. He conducts yoga teacher trainings several times a year and aims to build bridges between the experiences of yoga and the understandings of modern science. He is creator of the YinYoga.com website. Other books written by Bernie include Your Body, Your Yoga; From the Gita to the Grail: Exploring Yoga Stories & Western Myths, as well as YinSights. Bernie lives, teaches and offers workshops in Vancouver, Canada. Dr. Stuart McGill is Professor Emeritus after 32 years at the University of Waterloo where he had a laboratory/clinic that explored low back pain, rehabilitation and performance enhancement. He has been the author of over 240 medical and scientific journal papers. This work has received several international awards including the "Volvo Bioengineering Award for Low Back Pain Research". As a consultant, he has provided expertise on low back injury to various government agencies, many corporations and legal firms and professional/international athletes and teams world wide. He is regularly referred special and challenging patient cases from the international medical community for opinion. He has authored four books: "Gift of Injury" with Brian Carroll; "Back Mechanic" targeting the lay public with back pain; "Low Back Disorders: Evidence Based Prevention and Rehabilitation" designed for clinicians assessing and treating patients; and "Ultimate Back Fitness and Performance" targeting coaches and trainers. Timothy McCall, MD is a board-certified physician specializing in internal medicine, and the author of two books, Examining Your Doctor: A Patient's Guide to Avoiding Harmful Medical Care (Citadel Press) and Yoga as Medicine: The Yogic Prescription for Health and Healing (Bantam). He is co-editor of the first medical textbook on yoga therapy, The Principles and Practice of Yoga in Health Care (Handspring Publishing, 2016). He practiced medicine for more than 10 years in the Boston area before devoting himself full-time to investigating and teaching yoga therapy. Certified as a yoga therapist by the International Association of Yoga Therapists, he is the Founder/Director of Yoga As Medicine Seminars and Teacher Trainings and, until 2016, co-directed a yoga therapy center just outside of New York City.