Dr. O'Donnell is a Professor of Clinical Orthopaedic Surgery at the University of California, San Francisco. Dr. O'Donnell is Founder of the Orthopaedic Surgical Osseointegration Society (OSOS). He is Director of both the UCSF Musculoskeletal Research Consortium (METRiCS) and the UCSF international Center for Osseointegration Research, Education, and Surgery (iCORES). He served as Chief of the Orthopaedic Oncology Service in the UCSF Department of Orthopaedic Surgery from 2002 through 2019. He also served as Director of the Sarcoma Program at the UCSF Helen Diller Family Comprehensive Cancer Center through 2023. He was an Extramural Member of the Steering Committee for the Department of Defense Osseointegration Program and he is proud to have served under the auspices of the American Red Cross at the Walter Reed National Military Medical Center. He was also appointed as Visiting Professor of Surgery at the Harvard Medical School.