Charles Rennie Mackintosh (7 June 1868-10 December 1928) “was a Scottish architect, designer, water colourist and artist. He was a designer in the Post-Impressionist movement and also the main representative of Art Nouveau in the United Kingdom. He had considerable influence on European design. He was born in Glasgow…”
FROM https://alchetron.com/Charles-Rennie-Mackintosh-1221200-W

“Mackintosh was apprenticed to a local architect John Hutchison, but in 1889 he transferred to the larger, more established city practice of Honeyman and Keppie.

To complement his architectural apprenticeship, Mackintosh enrolled for evening classes at the Glasgow School of Art where he pursued various drawing programmes.”
FROM https://www.crmsociety.com/about-mackintosh/charles-rennie-mackintosh/

“The majority of Mackintosh’s architectural practice was supported by his wife Margaret Macdonald with whom he had studied at the Glasgow School of Art. Her mind was often responsible for the artistic flourish that became so integral to the aforementioned Mackintosh Rose motif. In his time as a professional architect, Mackintosh worked with his wife to design buildings ranging in use from residential, to commercial and religious.”
FROM https://www.archdaily.com/639483/spotlight-charles-rennie-mackintosh

“Despite success in Europe and the support of clients such as Blackie and Cranston, Mackintosh’s work met with considerable indifference at home and his career soon declined. Few private clients were sufficiently sympathetic to want his ‘total design’ of house and interior.
…
A move to the South of France in 1923 signalled the end of Mackintosh’s three-dimensional career and the last years of his life were spent painting. He died in London on 10 December 1928.”
FROM https://gsaarchives.net/collections/charles-rennie-mackintosh/

Design Museum~ https://designmuseum.org/designers/charles-rennie-mackintosh#toggle-submenu
Charles Rennie Mackintosh Society~ https://www.crmsociety.com/