Susan M. Kleiner, Ph.D., RD, CNS-E, FACN, FISSN, is owner of High Performance Nutrition LLC, a consulting firm in Mercer Island, Washington. A trailblazer and internationally recognized expert on nutrition for peak performance, Kleiner is a communicator and consultant, educator and coach, co-founder of the International Society of Sports Nutrition (ISSN) and the author of 10 books, including the bestselling books The New Power Eating, The Good Mood Diet, and Powerfood Nutrition.