Grandson of Ridley's founding Headmaster, Dr. J.O. Miller, ‘Tony’ Cassels was the Mason Gold Medal winner in 1936. He had an abiding interest in Ridley's affairs, as captain of the Ridley Fund in the 1930s, president of the Ridley College Old Boys Association in the 1960s and an influential member of the Board of Governors.
Cassels' wide-spread interests outside of the school included the 48th Highlanders Regiment, Red Cross, National Ballet of Canada, Argonaut Football Club, Ontario Historical Society, and the family law firm. He died in 1981. A ‘Tony Cassels Scholarship Fund’ was established that same year, and the major debating trophy bearing his name perpetuates the memory of this outstanding Ridleian.