Following completion of a pediatric residency at the Children's Hospital of Philadelphia, Dr. Levin was a child abuse pediatrician. He then completed an ophthalmology residency at Wills Eye Hospital in Philadelphia, followed by a pediatric ophthalmology fellowship at The Hospital for Sick Children in Toronto where he returned to become Professor in the Departments of Pediatrics, Genetics and Ophthalmology and Vision Sciences at the University of Toronto while working as a staff ophthalmologist at The Hospital for Sick Children for over 16 years. There he started the Ocular Genetics Program in 1995 with Dr. Brenda Gallie. In 2008 he returned to Wills as the Chief of Pediatric Ophthalmology and Ocular Genetics and Professor at the Sidney Kimmel Medical College of Thomas Jefferson University. There he established a new Ocular Genetics program. He is now the Chief of Pediatric Ophthalmology and Ocular Genetics at the Flaum Eye Institute and Golisano Children's Hospital as well as the Chief of Clinical Genetics at the University of Rochester Medical Center in New York. His team includes 2 ocular geneticists, two ocular genetics counsellors, ocular genetics fellows, and a genetic counselling assistant. He is actively involved in ocular genetics research, gene therapy and the development of stem cell techniques. He has published 316 papers in peer reviewed journals, 163 book chapters and 13 books. He has delivered over 1620 lectures/presentations nationally and internationally. He serves on the Executive Committee of the International Society of Genetic Eye Disease and Retinoblastoma (ISGEDR) and has held or holds leadership positions for many family groups devoted to rare genetic disorders including the Pediatric Glaucoma and Cataract Family Association, Alstrom International, Sturge-Weber Foundation, and the Cornelia de Lange Foundation. He is a member of the AAPOS Genetics Task Force. He has been an ocular geneticist for over 30 years.