Young Sun Diane Rhee, MD

Ashley Lee, MD, is an Instructor and Assisting Attending of Pediatrics at Columbia University Irving Medical Center. Dr. Lee attended Columbia University, NY for her undergraduate studies and medical school at Saint Louis University, MO. She then completed her Pediatric residency at Johns Hopkins in Baltimore, MD, and her fellowship in Allergy & Immunology at Icahn Mount Sinai School of Medicine, NY. Dr. Lee completed a year of research fellowship as the recipient of the 2023 Elliot and Roslyn Jaffe Research Award. She worked under the mentorship of Dr. Hugh Sampson, MD, to study the role of food allergen epitopes on food allergy diagnostics and prognostics.Dr. Lee's clinical areas of interest include food allergies, drug allergies, atopic dermatitis, and immunodeficiencies. She is also passionate about community health and providing equitable care to her patients. Her research interests include better understanding the mechanisms of allergic diseases and immunodeficiencies. She is board-certified in Pediatrics and Allergy & Immunology.

Dr. Zitsman graduated from Johns Hopkins University with a degree in natural sciences, and received his M.D. degree from Tufts University Medical School in 1976. He received his training in General Surgery at Tufts-New England Medical Center in Boston, and completed his Pediatric Surgery training at the Babies & Children's Hospital of New York. He is Board-Certified in General Surgery and Pediatric Surgery, and also holds a Certificate of Special Competence in Surgical Critical Care. Dr. Zitsman has maintained an active clinical practice in pediatric surgery in the New York area since 1985. He holds the rank of Professor of Surgery at the Columbia University Medical Center. His areas of interest include applications of minimally invasive techniques in pediatric surgery, chest wall deformities, and weight loss surgery in adolescents. Dr. Zitsman has been named to Castle Connolly’s Best Doctors in the New York area list annually since 2002. Dr. Zitsman is founder and Director of the Center for Adolescent Bariatric Surgery at the Morgan Stanley Children's Hospital of New York-Presbyterian. He is Principal Investigator for an FDA-approved adolescent laparoscopic adjustable gastric banding study. He has performed over 500 minimal access weight loss procedures and served as Chairman of the Committee on Obesity of the American Pediatric Surgical Association as well as Chairman of the Childhood Obesity Committee of the American Society for Metabolic and Bariatric Surgery. Dr Zitsman has served as a Consultant to the Medical Devices Evaluation Panel of the FDA.

Dr. Charles A. Popkin specializes in pediatric, adolescent, and collegiate sports medicine, with an emphasis on the operative and non-operative treatment of complex knee disorders. His specific clinical interests involve primary and revision ACL reconstruction, patellar instability, cartilage injuries and disorders, meniscal tears, and recalcitrant patellar tendinopathy. With dual fellowships in Pediatric Orthopedics and Sports Medicine, Dr. Popkin has dedicated his career to the comprehensive treatment and prevention of injury in developing athletes. He has a particular interest in the management of ice hockey injuries, serving as a team physician for USA Hockey, and on the USA Hockey National Safety and Protective Equipment Committee. Dr. Popkin is also the head team physician for: Fordham University, Mercy College, and the Hackley School in Tarrytown. In addition to his academic practice, Dr. Popkin conducts research on ACL injury prevention, ACL reconstruction techniques in the pediatric athlete, overuse injuries in youth sports, refractory patellar tendonitis, and shoulder instability in ice hockey. He pens a monthly "Ask Dr. Hockey" column for USA Hockey Magazine. Dr. Popkin lives in Westchester and enjoys spending time with his wife and two sons.