William Drummond Young (18 Apr 1854-21 May 1921) formed the company of W Drummond Young & Son in partnership with his son Edward (13 Oct 1876-28 Apr 1946). The partnership became Drummond Young & Watson in 1907, when Douglas Home Watson became a partner. and when he left in 1919 the company changed its name to W & E Drummond. Later, the firm was continued by the next generation and diversified into photocopying and printing.
[Source: Edinburgh Photographic Society website]