He won a gold medal at the 2008 Summer Olympics in the men's eights with Andrew Byrnes, Kyle Hamilton, Malcolm Howard, Kevin Light, Ben Rutledge, Dominic Seiterle, Jake Wetzel and cox Brian Price. Kreek's singing of O Canada at the medal ceremony was cited as an inspiration by Simon Whitfield, who won a silver medal in the triathlon. Whitfield wrote "Sing like Adam Kreek" on the handlebars of his bicycle and repeated "Sing like Kreek" to himself near the end of the race.
