Dr. Kosar is a Sudbury Ontario ophthalmologist specializing in Retinal Diseases. He is the Chief of Ophthalmology at Health Sciences North. He recently completed his term as the Ontario Medical Association Board member elected from the Surgical Assembly. He is returning to the OMA Board as Director from Northeastern Ontario. Dr. Kosar worked as a Family Doctor in Northern Ontario from 1982 to 1986.

Dr. Kosar is a Past President of the Sudbury & District Medical Society. He is the Past Chair of OMA District 9 (Northeastern Ontario). He has been OMA Section Chair for Ophthalmology and has served many years on OMA Council. The CNIB Eye Van program has Dr. Kosar as its Assistant Medical Director. He serves on the Board of Directors for Science North in Sudbury. Dr. Kosar is an Assistant Professor, Department of Surgery, Northern Ontario School of Medicine.

Dr. Kosar continues to carry on a busy practice in Sudbury while participating in various telemedicine projects involving remote screening for Diabetic Retinopathy.