Dr. McLean is board-certified in both internal medicine and rheumatology and is a Fellow in both American College of Physicians and the American College of Rheumatology. With the Connecticut chapter of the American College of Physicians, Dr. McLean has been active in health policy and health reform advocacy for many years and has served as the Governor of the CT ACP Chapter since 2009. He is currently Vice-Chairman of the ACP’s national Health & Public Policy Committee, and serves on the state of Connecticut’s Primary Care Access Authority as well as the SustiNet Healthcare Quality and Provider Advisory Committee. He also serves on the Board of Governors of the New Haven County Medical Association and is an active member of the Connecticut State Medical Society.

As Associate Clinical Professor in the Yale School of Medicine, Dr. McLean maintains active involvement in medical education through the frequent teaching of Yale medical students and hospital residents in his office.

In addition to the broad range of conditions and preventive strategies which comprise internal medicine, Dr. McLean's scope of practice involves the musculoskeletal conditions of rheumatology - encompassing an entire spectrum of bone, joint and muscle conditions and other connective tissue diseases. Osteoporosis has become a particular interest, and he is the director of Connecticut Medical Group's bone densitometry testing center. In this role, he reviews each DEXA bone density scan and individually prepares the interpretive reports sent to the ordering physicians.