While attending MIT John Marvin was the national intercollegiate sailing champion in 1946. At the US Olympic Trials 10 years later, he tied with George O’Day in the Finn class, but under a tie-breaking rule involving superior secondary placings, Marvin was declared the winner and gained the place on the Olympic team.
Marvin operated a commercial fishing business, the American Original Corporation. Sadly he was killed in an automobile accident in June 1980, after which his wife, Ann, took over running the business.