Robert Brown was an architect active in Scotland, with a practice in Edinburgh, Scotland in the early-19th century. He was the father of architect, Robert Brown, junior (born around 1804, died 1860), who joined the practice in 1830 and took it over after his father's death in 1832.
Sources:
Colvin, Howard, A Biographical Dictionary of British Architects 1600-1840, 3rd edition (New Haven and London: Yale University Press, 1995), pp. 167-168.