Simpson worked as an analyst on Seattle Mariners telecasts for five years before joining Turner Sports and the Atlanta Braves Radio Network in 1992.

[2] He called Atlanta Braves games on TBS and Turner South until broadcasts ended on those networks.

[2] Simpson was paired with Brian Jordan, Ron Gant and Tom Glavine during broadcasts on Peachtree TV.

He has served as the color analyst for the coverage of the 2009 National League Division Series between the Philadelphia Phillies and the Colorado Rockies with play-by-play commentator Brian Anderson.

[4] Beginning in 2019, Simpson became the regular color commentator for the Atlanta Braves Radio Network alongside play-by-play announcer Jim Powell.