Archibald Foulds was born in Quebec City in 1883 to Archibald and Mary (nee Cream) Foulds. The family moved to Toronto in 1900, and Foulds graduated from the University of Toronto in 1904. He joined the law firm of Macdonald, Shepley, Middleton & Donald. During this time, he joined the Queen’s Own Rifles. He married Kate Huldah Steele in 1912, and they would go on to have three children (Kenneth, Philip, and Derek).

Foulds entered the First World War as a Captain with the 123rd Infantry Battalion and was mentioned in General Haig’s dispatches for his and the rest of his unit’s role at Ypres during the Battle of Passchendaele. In May 1918, he joined the 8th Battalion Engineers, who were part of the Battle of Mons at the close of the War.

After the war, Foulds returned to practice. The Mason, Foulds law firm would become the largest counsel practice in Toronto. He lived in Toronto until his death in 1983.