Dr. Warner completed his medical degree and residency at the University of Rochester School of Medicine, NY, followed by a combined Harvard orthopedic surgery residency. He subsequently completed multiple research and clinical fellowships in Europe and New York City. At the University of Pittsburgh, Dr. Warner directed the Shoulder Biomechanics Laboratory and was Chief of the Shoulder Service as well as Associate Director of the Sports Medicine Center; Since coming to Harvard, he created the Shoulder Biomechanics Group and is the founder of the Boston Shoulder Institute, New England Shoulder and Elbow Society and the Codman Shoulder Society. He is a graduate of Harvard Business School (Executive Program) and has many ongoing collaborations in Value-Based Healthcare. Dr. Warner is a professor at Harvard Medical School, Co-Chief of The MGH Shoulder Service and Vice Chair of Quality and Safety for MGH Orthopedics. He is also former President of the American Shoulder and Elbow Society and incoming President of the San Diego Shoulder Institute.

He is the author of over 90 peer review publications, more than 300 book chapters, and 5 books. His clinical and basic research has been recognized by more than 30 regional, national and international awards. These have included the Kappa Delta Award of the American Academy of Orthopaedic Surgeons (Best Research in Orthopaedics), The O’Donoghue Award of the American Orthopaedic Society for Sports Medicine (Best Research in Sports Medicine), The Neer Award of the American Shoulder and Elbow Surgeons (Best Research in Shoulder Problems), The John Joyce Award of the International Arthroscopy Association, The O’Connor Award of the Arthroscopy Association of North America (Best Research in Arthroscopy), and the Award for Best Paper of the Orthopaedic Trauma Society. In 1994 he was selected as one of the two traveling fellows in the inaugural year of the American Shoulder and Elbow Surgeons Exchange Fellowship representing this society to The European Society of Shoulder and Elbow Surgeons. He has been a Visiting Professor and Lecturer on 300 occasions at meetings and Universities throughout Europe, Asia, and the United States.He is Board Certified in Orthopaedic Surgery and is a member of numerous specialty societies including the Orthopaedic Research Society, the American Shoulder and Elbow Surgeons, the American Orthopaedic Society for Sports Medicine, and the Arthroscopy Association of North America. His practice is principally devoted to the treatment of problems of the shoulder and elbow. He is the Founder of the New England Shoulder and Elbow Society and its current President.