 In 1951, he joined the on-air staff of Boston's WHDH-AM 850, where he hosted music programs before focusing exclusively on sports.WHDH at the time was the flagship station of the Boston Red Sox, and carried Boston Celtics basketball, Boston Bruins hockey and Harvard University football during the autumn and winter months.Gillis hosted pregame coverage of Red Sox games — his "Warmup Time" five-minute segment often revisited great moments in baseball history – and was a color commentator on Bruins and Celtics games.