In 1913, Rich was appointed to the newly created seventh seat on the bench of the
High Court of Australia, taking up his seat on 5 April of that year. He was appointed following the resignation of
Albert Piddington, who never took up his seat on the High Court but quit amid a controversy over his appointment. There has been some suggestion that Rich was a "safe" choice, because of his uncontroversial and uncombative nature, but Rich's legal ability was rarely questioned. Rich, who retired at age 87, holds the record for being the oldest justice to sit on the bench of the High Court. This record will almost certainly not be broken, since High Court justices now
must retire at age 70. It is said that, following the funeral of former justice Sir
Isaac Isaacs in 1943,
Hayden Starke said to Rich (who at that stage was 80 years old) "George, are you sure it's worth your while going home?"
League of Nations Prime Minister
Billy Hughes invited Rich to join the official Australian delegation to the Third Assembly of the
League of Nations, held in 1922 in
Geneva, Switzerland. He represented Australia on two committees – one dealing with "legal and constitutional questions" and the other dealing with "political questions" (including
League of Nations mandates). The head of the delegation, former prime minister
Joseph Cook, wrote Hughes that Rich's "legal knowledge and experience were most valuable in dealing with the numerous legal points that cropped up from time to time". Rich's membership of the delegation was the first of only three occasions on which a sitting High Court judge has filled a diplomatic role. The other instances occurring during World War II, when
John Latham and
Owen Dixon held ambassadorships. Rich returned to Australia via the United States, where he conducted a speaking tour. He gave speeches in
New York City,
Buffalo, and
Chicago, promoting the League's activities and criticising the U.S. for refusing to join. ==Retirement==