Former backstroke swimmer and 1992 Summer Olympics gold medalist Mark Tewksbury was the nation 's chef de mission , while former diver and 1984 Summer Olympics gold medalist Sylvie Bernier became an assistant chef de mission . Triathlete and double Olympic medalist Simon Whitfield was the nation 's flag bearer at the opening ceremony
opening ceremony
2012 Summer Olympics opening ceremony
Canada at the 2012 Summer Olympics