 Geissler tutored at Edinburgh College of Art in the 1920s before being appointed Art Master at Perth Academy in 1928.In 1931 he married Alison McDonald, later known as the glass engraver Alison Geissler, with whom he had three children, Paul, Erik and Catherine.In 1935 he took a post teaching art at Moray House College of Education, becoming Head of the Art Department in 1947 until his retirement in 1962.