Dr. Tannen earned his medical degree at the University of Pennsylvania. He completed his residency at the University of Medicine and Dentistry in New Jersey, where he was elected chief resident. Following residency, he completed a subspecialty fellowship training program in cornea and external disease at the internationally-renowned Wilmer Eye Institute, Johns Hopkins Hospital.

He currently serves as the vice chairman for Clinical Affairs and is the medical director of the Department of Ophthalmology at the prestigious Mount Sinai Medical Center in New York City. He has a vast experience with anterior segment surgery, including cataract surgery, corneal transplants, secondary intraocular lens procedures, and complex anterior segment reconstruction. He is one of the principal surgical instructors of resident physicians at Mount Sinai, where he has twice received the annual outstanding surgical teacher award, and was an invited instructor at the Harvard Medical School cataract surgery course.

His research interests include corneal biomechanics, imaging techniques for ocular inflammatory diseases, surgical techniques in corneal transplantation, and refractive outcomes after cataract surgery. He has published numerous articles in the ophthalmic literature, and presented widely at national and international meetings.

Dr. Tannen provides both comprehensive and subspeciality eye care, with a focus on anterior segment surgery, cataract surgery, including multifocal and toric intraocular lenses, corneal diseases including corneal transplantation and DSEK, andlaser refractive surgery including LASIK and PRK.