William Wadsworth was a member of the Toronto Argonaut Rowing Club when he was selected to represent Canada at the 1904 Summer Olympics. There, alongside Alan Bailey, Phil Boyd, Thomas Loudon, Donald MacKenzie, Pat Reiffenstein, Colonel Rice, George Strange, and Joe Wright, Sr., he lost to the Vesper Boat Club of the United States in the final of the coxed eights. As there were only two teams in the event, however, Canada earned a silver medal. The following year he helped the Argonauts capture the coxless fours and eights titles at the 1905 edition of Canada’s Henley Royal Regatta. Wadsworth earned a bachelor’s degree with first class honors in history and modern languages from the University of Toronto’s Trinity College in 1896 and a law degree from its Osgoode Hall Law School in 1899. As he a student he was involved in many athletic pursuits, including ice hockey, and was a member of the Phi Delta Phi legal fraternity. Wadsworth was later a prominent lawyer in Toronto and, at his death in August 1971 at the age of 95, was believed to be the oldest practicing lawyer.