Leonard Williams was active as an architect in England in the early years of the twentieth century. His name is listed in Directory of British Architects 1834-1914. Compiled by Antonia Brodie, et al. Volume 2: L-Z, without any further information apart from from the date of death which is given as 1926, but this may be incorrect.
Note: it is possible that this architect was James Leonard Williams (1864-1927)
Worked in
UK
Bibliography
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