Today Mark is a recognized as a leader of social change.  Author of three books, including Inside Out:  Straight Talk from a Gay Jock, Tewksbury is one of the few openly gay Olympic champions in the world.  With other leading Canadian advocates and athletes, Mark co-founded OATH to take a difficult but necessary step to hold the International Olympic Committee accountable to its own ideals.  In 2006, he was the president of the 1st World Outgames held in Montreal, was recognized as one of OUT Magazine’s top 100 people, and in 2007 was named by Foundation Emergence as the person of the year for his fight against homophobia.

In 2008 Mark was asked by the Government of France to speak on LGBT issues at the United Nations in NYC, and in 2010 Mark was an ambassador for the historic Pride House at the Vancouver Winter Olympic Games, ensuring the LGBT community had a presence for the first time at the Olympic and Paralympic Games.  For his ethical leadership and active humanitarianism, Mark has received Honorary Doctorate of Laws degrees from the University of Western Ontario, and the University of Calgary. 

Mark is currently the Chef de Mission of the Canadian Olympic team competing in London, England in 2012.