All of our physicians are board certified in their specialty We would like to welcome you and your family to our medical practice. We will do everything we can in order to make your experience with us as satisfying as possible. The Institute for Respiratory and Sleep Medicine is a Pulmonary and Sleep medicine practice. Our medical practice specializes in the evaluation and treatment of patients with acute and chronic pulmonary disorders. We are also uniquely qualified to evaluate and treat patients with a wide range of sleep disorders. Our practice includes physicians Dr.John P. Mahan, Dr. Howard J. Lee, Dr. Richard D. Shusterman, Dr. Bruce B. Dershaw, Dr. Peter C. Serpico, and Dr. Rudolf Khusid. For the convenience of our patients, we offer three locations in Pennsylvania: Langhorne, Bristol, and Philadelphia. All of our physicians are board certified in their specialty with many years of experience.