Dr. Felsenstein received his medical degree from New York University School of Medicine. He completed his internship at Bellevue Hospital and dermatology residency at Kings County SUNY Downstate. Dr. Felsenstein is a fellow of the American Academy of Dermatology and is a clinical assistant professor in the Department of Dermatology at New York University School of Medicine. He is affiliated with Tisch NYU hospital medical center and Bellevue hospital center. Dr. Felsenstein has been awarded “Top Doctors” by Castle Connolly, a prestigious title given to physicians. Dr. Felsenstein is the founder of our Ossining office. He is well-loved by his patients.