Team during his junior career: • Laval National: 1972-1973 to 1976-1977

He started his career playing four games for the Laval National in 1972-1973 and then had four consecutive seasons during which he scored 70 goals or more. He attained a personal record of 84 goals, 65 assists and 149 points during the 1974-1975 season. He won the Michel Bergeron Trophy (best rookie) in 1973-1974 and the Frank J. Selke Trophy (most sportsmanlike player) in 1976-1977. 

As a right wing, he was named to the first all-star team in 1974-1975, to the second team in 1976-1977 and to the first team for the Western division in 1975-1976. He is the only player in the history of Canadian junior hockey to have scored over 300 goals (309) and he still holds this record. During his illustrious career, he maintained an average of 2.015 points per game, totaling 532 points in 264 games. This record of 532 points (309-223-532) places him ninth among the best scorers of the QMJHL. On January 6, 1975, when the Laval National defeated the Sorel Éperviers 8-4 at the Centre Sportif Laval, he earned no fewer than five points (2-3-5) in only 6 min. 48 sec. during the third period. 

The QMJHL has awarded a trophy in his name since the 1980-1981 season. It goes to the player identified as the best professional prospect each season.

 Information on his professional career 
NATIONAL HOCKEY LEAGUE 
He spent his entire professional career with the New York Islanders.With that team, he won the Stanley Cup four times in a row, from 1979-1980 to 1982-1983, also winning the regular season championship in 1978-1979, 1980-1981 and 1981-1982. He is the only player in the history of the National Hockey League to have scored 50 goals or more in nine consecutive seasons (1977-1978 to 1985-1986). He was inducted to the NHL Hall of Fame in 1991. He was inducted to the QMJHL Hall of Fame on March 17, 1998. He has won the following personal honours: • Calder Trophy (best rookie) in 1977-1978. • Lady Bing Trophy (most gentlemanly conduct) in 1982-1983, 1983-1984 and 1985-1986. • Conn Smythe Trophy (most valuable player in playoffs) in 1981-1982 • First all-star team in 1980-1981, 1981-1982, 1982-1983, 1983-1984, and 1985-1986 • Second all-star team in 1977-1978, 1978-1979 and 1984-1985.