George Charles Williamson was a collector and prolific writer on art collecting and connoisseurship.
His books include Murilo (London, 1902), a revision of M. Bryan's Dictionary of painters and engravers (1903-1905) and Murray Marks and his friends (1919).
Who was who: a companion to Who's who, London, 1920 et seq.; National Library of Scotland on-line catalogue, http://main-cat.nls.uk (accessed 2005).