Dr. G. John Mullen graduated with a Doctorate in Physical Therapy from the University of Southern California (USC). At USC, John worked on projects investigating lung adaptations in swimmers. He has contributed to Swimming World Magazine, Swimmer Magazine, the Journal of the International Society of Swim Coaches, Sports Rehab Expert, and STACK Magazine. He is also the founder of Swimming Science, the monthly Swimming Science Research Review, and the Swimmer’s Shoulder System. He is on the advisory board for the International Society of Swim Coaches. Dr. John consults for many sports teams and is the CEO of COR Physical Therapy and Personal Training in Santa Clara, CA. He swam collegiately at Purdue University and is currently a Masters World Record holder.