Health and fitness expert Mark Sisson is the bestselling author of The Primal Blueprint and several other Primal Blueprint-branded books, and one of the leading voices of the burgeoning Evolutionary Health Movement. His blog, MarksDailyApple.com, has paved the way for Primal enthusiasts to challenge conventional wisdom's diet and exercise principles and take personal responsibility for their health and well-being. From its humble - and controversial - beginnings in 2006, Mark's Daily Apple has grown into one of the highest-ranked health information resources on the Internet, with some 3 million unique visitors each month. Mark has a BA in biology from Williams College and is a former world-class endurance athlete, with a 2:18 marathon and a fourth-place finish in the Hawaii Ironman World Triathlon Championships to his credit.