Born at Lynden, County of Wentworth, Ontario, the son of Nathaniel Dyment, of English descent, and Annie McRae, of Scottish origin, he was educated at Barrie Collegiate Institute and at Upper Canada College. Dyment was a prosperous manufacturer and dealer in lumber, based in Thessalon, Ontario.
Born in Lynden, County of Wentworth, Ontario, the son of Nathaniel Dyment, with English roots, and Annie McRae, with Scottish heritage, he pursued his education at Barrie Collegiate Institute and Upper Canada College. He was a prominent figure in Thessalon, Ontario's lumber trade.