He played for the Toronto Maple Leafs, Pittsburgh Penguins, Buffalo Sabres, and Colorado Rockies from 1970 to 1982.

[2] He was subsequently placed in the same forward line as center Gilbert Perreault and left winger Rick Martin, and the trio became known as The French Connection.

[5][6] A statue of the famous forward line, unveiled in 2012,[7] is located in front the Sabres arena, KeyBank Center.

[2] The team then unexpectedly advanced to the 1973 Stanley Cup playoffs,[6] with Robert scoring the franchise's first overtime goal on April 10, 1973, in Game 5 against the Montreal Canadiens, who went on to win the series.

[2] Robert was named captain of the Rockies,[10] before being traded on January 30, 1981, to the Maple Leafs, with whom he played his final season in 1981–82.

[2] After retiring from professional ice hockey, Robert acted as president of the NHL Alumni Association.