Opthamologist specializing in hereditary retinal degenerations. Director, Electroretinography Service at Mass Eye and Ear as well as William F. Chatlos Professor of Ophthalmology at Harvard Medical School.

Practice limited to Ophthalmology, Ophthalmic Surgery, Botulinum Toxin: Related Therapeutics. Personal medical care, education and humanitarian research.

Specialist in Comprehensive Ophthalmology at Mass Eye and Ear. Director, Comprehensive Ophthalmology Service and Instructor in Ophthalmology, Harvard Medical School.

Specialist in Primary eye care, cataract, glaucoma at Mass Eye and Ear. Also Assistant Professor of Ophthalmology, Harvard Medical School.

Surgeon specializing in Compehensive Ophthalmology at Mass Eye and Ear. Also Instructor in Ophthalmology, Harvard Medical School.

Ophthalmologist of Mass Eye & Ear Infirmary.

Physician specializing in Ophthalmology, Cornea and External Diseases, Ocular Inflammation and Uveitis, Corneal Transplantation, Reconstruction and Stem Cell Clinical Research, Ocular Surface Reconstruction and Stem Cell Transplantation, Clinical Research. Director of Cornea and Refractive Surgery Services, MEEI. Professor, Senior Scientist, Harvard Medical School. W. Clement Stone Scholar and Director of the Corneal Immunology Lab, Schepens Eye Research Institute. Director, Harvard-Vision Clinical Scientist Development Program.

Specialist in Corneal Diseases and Corneal Physiology. Professor of Ophthalmology, Harvard Medical School. Massachusetts Eye and Ear Infirmary, Chief Emeritus.