George Swan Challies was born in Ottawa and was educated at McGill University, and L'Ecole des Sciences Politiques, Paris. He was called to the Bar of Québec in 1935 and practised law with the firm of Brown, Montgomery, and McMichael in Montréal from 1935 to 1949. In 1949, he was appointed a Justice of the Superior Court of Québec and was Associate Chief Justice from 1963 to 1973. From 1945 to 1970, Challies lectured in Civil Procedure in the Faculty of Law and in Engineering Law in the Faculty of Engineering at McGill University. In 1947, he was created K.C. Challies also served as a member of the Committee for Revision of the Code of Civil Procedure of Québec, 1960-1965. He co-authored Unjustified Enrichment in Québec, (1st ed. 1940, 2nd ed. 1952) and The Law of Expropriation, (1st ed. 1954; 2nd ed. 1963). As well, he translated Cheradame's Les Deux Amériques into English (The Two Americas, 1941).