Mary Newton Mann née Harrington was the daughter of James & Cecilia Harrington of Glasgow. She married John Mann (1827-1910), a chartered accountant of Queenslea, Cathcart, Renfrew, himself the son of of the painter John Mann (1797-1827). The Manns had a son, Harrington who became a landscape and portrait painter.
Mary Mann was in touch with JW in 1892. At the time JW agreed to contribute to a specially bound collection of artists' works, to be sold for the benefit of Queen Margaret College, a women's college which became part of the University of Glasgow in 1895 (#03987, #08084, #03988). Mann's son Harrington was amongst the many Scottish artists who signed the petition to Glasgow City Council urging the purchase of Arrangement in Grey and Black, No. 2: Portrait of Thomas Carlyle (YMSM 137) in 1891 (#12326).
Begg, T., The Excellent Women: The Origins and History of Queen Margaret College, Edinburgh, 1994; information from family descendant.