[2] Stewart played thirteen seasons for the Toronto Maple Leafs, taking part with them in three Stanley Cup championships in the early 1960s.

During team practice sessions, he usually won the end-to-end skating rushes though during league games, he didn't often demonstrate his blazing speed in the same way as did Dave Keon and Frank Mahovlich.

size, Ron was particularly adept in a defensive fore-checking role and former New York Ranger coach, Emile Francis regarded Stewart as one of the very best penalty-killers in the league.

Offensively, Stewart was not a prolific goal scorer but he possessed a very quick wrist shot that made him a scoring threat.

After the 1969–1970 season ended, Stewart and Rangers teammate Terry Sawchuk, both of whom had been drinking, argued over expenses for the house they rented together on Long Island, New York.