Dr. Mack graduated from Princeton University in 1957 and graduated from Case Western Reserve University in 1961.  Upon completing his orthopaedic residency at University Hospitals in Cleveland, Ohio in 1966, he then served 2 years in the USAF as Chief of Orthopaedics at the 36th TAC Hospital in Bitburg, Germany.  Dr. Mack returned to Cleveland to become Chief of Orthopaedics at Metropolitan General Hospital and was a clinical instructor at University Hospital

In 1977, Dr. Mack moved to Denver to join the Denver Orthopaedic Clinic where he practiced for 19 years.  He has been on the Boards of the Colorado Outward Bound School, Boys and Girls Clubs, and The Orthopaedic Society for Sports Medicine (AOSSM).

In 1996, Dr. Mack joined the Steadman-Hawkins Clinic where he served as a consultant.  However, his true love has been the Aspen Valley where he and his wife Patty now live full time.  He has joined the Orthopaedic Associates with the goal of treating arthritis and low back problems with non-operative therapies.