View Post ABC Affiliates | Top 10 After 40 Years at WCVB, Dr. Tim Johnson to Retire By Merrill Knox on Dec. 6, 2012 - 7:02 PM Dr. Timothy Johnson, the medical editor at WCVB, has announced his retirement from the Boston ABC affiliate. Johnson has worked for WCVB since its launch in 1972. He is also a senior medical contributor to ABC News, providing on-a ...