Broadcasting Legend Bob Costas Leaves NBC After Four Decades Costas joined the network
back in 1979. He has called nearly every kind of
major sporting event for NBC for the last 40 years, including the World Series,
Super Bowls and the NBA Finals. According to Costas, his split with
NBC was amicable. Bob Costas, via
'The New York Post' The 66-year-old says he will still remain on the air with the MLB Network, calling baseball games from time to time.
