 He subsequently attended Stanford University, where he won a Pac-10 championship in the high jump in 1988; his jump remained the all-time record for a Stanford University athlete as of 2016.At the 1988 Summer Olympics, he jumped , placing 17th — a tie with fellow Canadian jumper Milton Ottey and South Korean jumper Cho Hyun-Wook — and failing to qualify for the finals.Marshall came out as gay in 1994 by attending a political gala at Rideau Hall as the guest of Svend Robinson, Canada's first openly gay Member of Parliament.