Francis Osler [also known as Frank Osler] was born in Darwen, Lancashire, England on 18 March 1881 and was articled to Thomas Worthington (1826-1909) and Percy Scott Worthington (1864-1939) of Thomas Worthington & Son in Manchester. He then worked as an assistant to Fred Rowntree (1860-1927) in London. In 1909 Osler qualified as an architect and was elected an Associate of the Royal Institute of British Architects (ARIBA) the following year.
Osler subsequently practised as an architect in London until at least the late 1930s. He was also an etcher. Three etchings by him were illustrated in The Studio in May 1915. He exhibited at the Royal Academy in London in 1930.
Osler's address was given as 11 Hammersmith Terrace, London and 44 Weltze Road, Hammersmith, London in 1910; 9 Gray's Inn Square, London in 1914; 3 Hammersmith Terrace, London in 1923 and 1935; 28 Queensborough Terrace, Hyde Park, London in 1930; and 5 Hammersmith Terrace, London and Island House Chiswick Mall, Brentford, Middlesex in 1939. He died in Winchester, Hampshire on 21 April 1964. His death was recorded as Frank Osler.
Directory of British Architects 1834-1914. Compiled by Antonia Brodie, et al. Volume 2: L-Z. London; New York: British Architectural Library, Royal Institute of British Architects/Continuum, 2001