G. John Mullen received his Doctorate in Physical Therapy from the University of Southern California, where he served as a clinical research assistant investigating adolescent diabetes, lung adaptations to swimming, and swimming biomechanics. He has been featured in "Swimming World Magazine," "Swimmer Magazine," and the "International Society of Swim Coaches Journal." He is currently the strength and conditioning coach at Santa Clara Swim Club, owner of the Center of Optimal Restoration, the Swimming Science Research Review and creator of the Swimmer's Shoulder System.