An Olympian, he won five Canadian championships (1976, 1978, 1979, 1980, 1981), two Pan Am Games titles (1975, 1979), two Canadian Interuniversity Athletics Union championships, and four titles at the Maccabiah Games in Israel.

After graduating from McGill University, he worked at the International Olympic Committee, including 35 years as the Director of Legal Affairs.

[3] He won a gold medal in Greco-Roman wrestling at the 1975 Pan American Games in Mexico City.

[9][4][10][11] He became the first McGill recipient to be selected as the most outstanding wrestler—receiving that honour at the 1977-78 Canadian Interuniversity Sport championship—and earned CIAU All-Canadian status for the second time, in 1980-81 after winning gold in the 72 kg weight class at the Canadian Nationals.

[3] After Stupp graduated from McGill University, he worked at the International Olympic Committee from 1981 until 2020, where he attained the position of Director of Legal Affairs, and held that post for 35 years.