Dr. Dyster earned his undergraduate degree in science from Niagara University. He then earned his M.D. from the University of New York at Buffalo, Medical School. He had both a rotating and general medical internship at Mount St. Mary's Hospital.
Dr. Dyster has over 50 years of experience as a family physician. Over the years, he has served as an attending at both Niagara Falls Memorial Medical Center and Mount St. Mary's Hospital. He has been Chief of the Department of Family Practice at Niagara Falls Memorial Medical Center for over 30 years. He founded Memorial's Family Residency Program that now bears his name, and he has been its director emeritus. He is a medical advisor at Niagara University's Health Center. Dr. Dyster also founded both the Migrant Workers Clinic and the Niagara Reserve Corps, which was established to assist in the event of natural or terrorist disasters. Dr. Dyster was in the National Guard/Army Reserve for 43 years until he retired as a colonel.