Areas of expertise for Dr. Gellhorn include shoulder tendonitis, tennis elbow (lateral epicondylitis), and carpal tunnel syndrome. He accepts several insurance carriers, including Coresource, Blue Cross/Blue Shield, and Healthfirst. After completing medical school at the University of Pennsylvania School of Medicine, he performed his residency at a hospital affiliated with the University of Washington. He has received the following distinction: New York Rising Stars. Dr. Gellhorn is professionally affiliated with Weill Cornell Medicine.