Gilbert Andrew Harrison was born in Headington, Oxfordshire, England on 6 November 1876 and trained as an architect under Harry Wilkinson Moore (1850-1915) in Oxford. He commenced independent practice as an architect in Oxford in 1903 and was in partnership with his brother, Nathaniel William Harrison (1865-1944). By the early 1920s he had relocated his practice to Maidenhead in Berkshire. He was a Member of the Society of Architects (MSA) and was admitted a Licentiate of the Royal Institute of British Architects (LRIBA) in 1925. He died in Sonning Common, Oxfordshire on 16 February 1962
Residences for Prof. W. M. Geldart, Prof. L. P. Jacks, Dr. B. W. Ainley Walker, George R. Davis, Esq.; East Oxford Conservative Club — all at Oxford.
Directory of British Architects 1834-1914. Compiled by Antonia Brodie, et al. Volume 1: A-K. London; New York: British Architectural Library, Royal Institute of British Architects/Continuum, 2001