Robert graduated as an architect from the University of Melbourne in 1968.
He then worked with Alistair Knox in Eltham until early 1973, punctuated with an extensive overseas trip.
In 1973 Robert set up his own architectural practice (Robert Marshall P/L).
In the mid 1980s Robert set up a building company (Hurstbridge Design & Construction P/L) and ran this in tandem with his architectural company.
Staff numbers varied, rising at one time to a total of 23.
On his website Robert says,
"After designing numerous houses (and building approximately twenty of them), designing more than a dozen schools, designing several churches and designing many commercial developments, Robert ceased employing architects, draftspersons, builders, tradesmen and apprentices during the mid 1990s.
"Robert now works as a sole practitioner from his home office, concentrating on design, documentation and architect's administration of construction.
"Much to the chagrin of my university lecturers, for many years I've said "I learnt everything I know" (about environmental building design) from Alistair Knox and other Eltham identities when I worked in Alistair's Eltham studio and on his building sites back in the 70's. These days I work from the old rambling family weatherboard home in Panton Hill and design mostly houses, half in the Nillumbik area and the other half across the eastern states of Australia. I design in many "natural" materials, but energy efficient mud brick houses are my forte and the designs I enjoy most."