 During World War I, he was chair of Special Subscriptions Committee - Victory Loans 1911-1918.He served as president of the Investment Dealers Association of Canada 1920-1921, was a Governor of the Investment Bankers' Association of America, and served on the board of directors of Canada Cement, Massey-Harris, Simpsons Ltd, Dominion Steel and Coal Company.Gundy donated the land for Serena Gundy Park in Toronto, named in his first wife's memory.