1952 Lyon joined the office of Leslie M. Perrott & Associates. Ronald Lyon married Marietta Perrott, daughter of Leslie M Perrott Sr, who worked in her father's firm as an architecture renderer and illustrator; they had four sons, Corbett, Cameron (died 2018), Carey and Hamish, all of whom became architects. In 1996 three of the sons set up an office, Lyons Architecture which is one of Australia's leading architecture firms today. In 1970 'Tiger' became a formal partner, with Leslie M Perrott (Jnr), by then his brother in law. In the early 1980s he was the lead designer with Gerard De Prue on the Rialto Towers. Throughout four decades of successful practice, Lyon was deeply involved in professional, industrial and welfare activities. He was President of the RVIA in 1965, and again under the new name, the 'RAIA Victorian Chapter', in 1966. In 1984 Ronald Lyon was awarded an AM for services to the community and his profession. Marietta died in 2003, followed by Ronald in 2006. Leslie M Perrott Junior (1926–2001) After graduating in 1951, Leslie Jnr, known simply as Les Perrott, set about expanding the office to take part in the postwar boom. With the retirement of his father in 1966, he became lead architect of the firm, along with Ron Lyon, and was generally responsible for getting in the work rather than designing. Brian George Mathieson In 1967 Brian Mathieson won an RAIA Silver Medal for his Thesis on High Density Housing. He was the lead designer for the MMBW project, and was the last remaining partner when the firm wound up c2015. David Simpson (1929– ) After graduation in 1955 and working for a few years in the UK and Canada, David Simpson joined the firm in the early 1960s, and was soon given the responsibility for the Princes Gate project. Because of this project, David was made the associate in charge of the Museum Underground Railway Station construction (see also City Loop). The station fit-out and loop graphics were undertaken for the firm by project designer Graeme Butler (see Graeme Butler), aided by Elton Cassumbhoy who was in charge of the project documentation, detailing and construction. Graeme also designed the Museum Station above-ground entrances: Queen Elizabeth Plaza facing Swanston street, and the North and South Station Entrances- all since demolished. David left when the firm contracted in about 1980. Carey Lyon The son of Ron