Dr. Kirschenbaum's career as an orthopaedic surgeon is notable and unique. It includes in-depth experience in operations leadership, process reengineering, information technology, and innovation design. He has lectured and published extensively on information technology, electronic media, and practice management, as well as clinical topics in orthopaedic surgery, including joint replacement. Dr. Kirschenbaum has designed major joint replacement systems and is recognized in this surgical technique. Prior to joining Bronx-Lebanon, Dr. Kirschenbaum served as Chief of Adult Reconstructive Surgery for the Kaiser Permanente System, and was the managing partner of a large multispecialty group. He was also involved in a solo joint replacement practice that completed nearly 500 operations annually. Dr. Kirschenbaum was part of the team that developed Medscape and eventually sold it to GE and then to WebMD. He also served as the Community Health Editor of WebMD. His patient message board and blogs in medical ethics and arthritis/joint disease were especially popular. Dr. Kirschenbaum attended Brown University where he graduated Magna Cum Laude. He subsequently attended and graduated from the Albert Einstein College of Medicine. After an internship in General Surgery, he performed a research fellowship in cartilage and joint aging at the National Institutes of Health in Bethesda and the Albert Einstein College of Medicine, where he completed an orthopaedic surgery residency (which also included Montefiore Medical Center, Jacobi Hospital, and North Central Bronx Hospital). Following his residency, Dr. Kirschenbaum continued his training at the prestigious Rothman Institute, Pennsylvania Hospital and Thomas Jefferson University in Philadelphia. There he completed his fellowship in hip and knee replacement and reconstructive surgery.