David J. Jacofsky, MD was born in Long Island, New York and is an international authority on adult reconstruction of the hip and knee. He received his residency training at the Mayo Clinic in Rochester, Minnesota and did his fellowship training at Johns Hopkins University in Baltimore, Maryland, during which time he was awarded the Mayo Scholar's Award and the Joe Janes' Humanitarian Award. Dr. Jacofsky started his career as an attending at the Mayo Clinic and subsequently moved to Phoenix, Arizona where he founded The CORE Institute. Dr. Jacofsky has published over 40 articles and 20 book chapters and has lectured around the world. He has a keen interest in health care reform, cost containment, improved outcomes, and the changing demographics of arthroplasty. Dr. Jacofsky is an avid martial artist and enjoys weight-lifting and running. Anthony K. Hedley, MD, FRCS is a fellow of the Royal College of Surgeons of Edinburgh and an acclaimed orthopedic surgeon, author, researcher, and educator specializing in joint reconstruction. After graduating from medical school in South Africa, Dr. Hedley completed his general and orthopedic residency training at Natalspruit Hospital in Johannesburg. He then sat for the exams and was named a Fellow of The Royal College of Surgeons of Edinburgh. Dr. Hedley returned to South Africa to complete an orthopedic residency at Johannesburg General Hospital. After, having registered as a Specialist Orthopedic Surgeon with the South African boards, he traveled to London and did a brief sojourn with the late, world-famous teacher and author Alan Apley at St. Thomas Hospital. Dr. Hedley came to the University of California, Los Angeles (UCLA) in 1977 to start a fellowship in Orthopedic Bioengineering with Dr. Harlan Amstutz of the Division of Orthopedic Surgery at UCLA. This was followed by 4 years in the Junior Professor ranks as an Assistant Professor. Dr. Hedley left UCLA at the end of 1982 and moved to Phoenix, Arizona, to join a private practice partnership. He served as the Chairman of the Department of Orthopedics at St. Luke's Hospital from 1987 to 2005. He became an inventor with Howmedica in 1982. He is currently an inventor and consultant with Stryker Orthopaedics and is involved in several clinical research projects. Dr. Hedley is well known in the arthroplasty world for his various contributions both from the podium and in referee journals. He has headed a joint replacement fellowship since 1983 and continues to do so. From this, he is now associated with 45 fellows who have gone out into the community to continue their work as hip or knee arthroplasty surgeons.