Team Doctors
Chip Hummer, M.D.
Chief Medical Director

Dr. Hummer joined Orthopaedic Associates Division of Premier Orthoapedics in 1995. Dr. Hummer graduated from Amherst College in 1985, with a B.A. in Biology, Phi Beta Kappa. He received his M.D. degree from Jefferson Medical College in 1989, and in the year following graduation, served a one year surgical internship at Pennsylvania Hospital, the first hospital in the United States.

His Orthopaedic Surgery residency was completed at Thomas Jefferson University, and following residency he completed a fellowship in Orthopaedic Sports Medicine at the University of Cincinnati, where he was an assistant team physician with the Cincinnati Bengals of the NFL, as well as with the University of Cincinnati.

A career long resident of Delaware and Chester Counties who began practice in 1995, Dr. Hummer is President of the Orthopaedic Associates Division of Premier, and he is also past President of and a current member of the Board of Directors of both the Pennsylvania Orthoapedic Society and the Delaware County Medical Society. He is a Board Certified member of the American Academy of Orthopaedic Surgeons, serves on the Medical Liability Committee of that organization, and is also a Fellow of the American College of Surgeons as well as a member of the American Orthopaedic Society for Sports Medicine. Dr. Hummer earned a Certificate of Added Qualifications in Sports Medicine from the American Board of Orthopaedic Surgery and was notified of this in January 2010.

Dr. Hummer is currently the Director of Sports Medicine and Team Physician for Swarthmore College, and was recently chosen to be the Team Physician for the Philadelphia Union of Major League Soccer. He believes that optimum care for patients with bone and joint pain or injury is community based and personal, allowing for a strong patient-physician working relationship.

He resides in Glen Mills with his wife and two children. Dr. Hummer maintains medical staff privileges at the Crozer Keystone Health System, Main Line Health System/Riddle Memorial Hospital and at St. Francis Hospital in Delaware.

James T. McGlynn, M.D.
Team Physician

Dr. McGlynn joined Orthopaedic Associates Division of Premier Orthopaedics in 1991, after completing a four-year commitment with the U.S. Navy, including a tour of duty in Desert Storm. Dr. McGlynn has a special interest in Sports Medicine, including arthroscopic surgery of both the upper and lower extremities. He is also skilled in joint replacement of the shoulder, knee and hip.
Graduating from the University of Scranton with a B.S. degree in Biology, Dr. McGlynn received his M.D. from Georgetown University in 1982. He completed his orthopaedic residency at Georgetown University Medical Center in 1987. He remains Board Certified in orthopaedic surgery since 1989 and earned subspecialty certification in Orthopaedic Sports Medicine in 2009.

Dr. McGlynn is a member of the following societies: American Academy of Orthopaedic Surgery, American Medical Association, Delaware County Medical Society, Pennsylvania Medical Society, Pennsylvania Orthopaedic Society, and the Society for Military Orthopaedic Surgeons. He is presently the Team Physician for the Philadelphia Union of Major League Soccer, and the Team Physician for Cardinal O'Hara High School.

Dr. McGlynn maintains medical staff privileges at Crozer Keystone Health System and Main Line Health System/Riddle Memorial Hospital in Pennsylvania and at St. Francis Hospital in Delaware. He is a native of Delaware County and currently resides in Wallingford with his wife and has two grown children.

Steven J. Collina, M.D.
Primary Care Sports Medicine Physician

A graduate of the University of South Florida College of Medicine, Dr. Collina completed a sports medicine fellowship at the University of Pittsburgh Medical Center (UPMC) and a family medicine residency at UPMC-Shadyside Hospital.

Board-certified in sports medicine and family medicine, Dr. Collina is a team physician for the Philadelphia Union as well as Ridley High School and Chester High School (in Delaware County, Pennsylvania). He has also served as medical director of the Keystone State Games and The Philadelphia Triathlon. His professional affiliations include the American Medical Society for Sports Medicine, the American College of Sports Medicine and the American Academy of Family Physicians.

Dr. Collina specializes in the treatment of sports-related concussion and diagnosis of chronic exertional compartment syndrome. Dr. Collina seeks to provide his patients with an up-to-date, nonsurgical approach to the medical and musculoskeletal problems that prevent them from achieving their health, fitness and performance goals. He believes in educating patients so that they may actively participate in their health care choices.

Dr. Collina is the Chief of Sports Medicine at Crozer-Keyston Health System and the Director of the Crozer-Keystone Sports Medicine Fellowship Program.

David Webner, M.D.
Primary Care Sports Medicine Physician

Dr. David Webner is a board-certified, sports medicine physician at the Healthplex Sports Medicine Institute and the Co-Director of the sports medicine fellowship at the Crozer-Keystone Health System in suburban Philadelphia. His main research interests include concussion in sports and endurance sports medicine.  He currently is engaged in studies on concussion in football players, and sudden cardiac arrest in U.S. marathons.

In addition to managing sports concussions in athletes, Dr. Webner’s sports medicine practice includes recreational, amateur and professional athletes of all ages with musculoskeletal injuries. He has been a team physician with the Philadelphia Union since its inception in 2010.