Charles Stewart Still Johnston was born in the Orkney Isles, Scotland on 11 March 1850. After studying at Glasgow School of Art from c.1866 to c.1870, he was articled to David Bryce (1803-1876) in Edinburgh from c.1850 to c.1874.
In the mid-1870s Johnston set up his own independent architectural practice in Edinburgh. In the early 1890s worked in collaboration with David B. Burnie on projects, such as the West Fife Infectious Diseases Hospital (1892). Johnston closed his practice in 1915, probably because of the lack of commissions during World War Two and because he had reached retirement age. He died in Edinburgh on 3 April 1924. His obituary appeared in The Builder vol. 126, 18 April p, 628.
See Dictionary of Scottish Architects 1660-1980 [link below] for a list of work by Charles Stewart Still Johnston from 1881 to 1911
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