Beatrice MacDermott was born in 1899. Nothing is known about her training as an artist. She worked as a mural painter and illustrator in Britain during the 1930s and 1940s. She painted murals and the curtain for the Stanford Hall Theatre in Stanford on Soar, Nottinghamshire [built by Cecil Aubrey Massey in 1938], painted murals for the Cunard White Star luxury ocean liner, 'Caronia' [launched in 1947], and for the Gleneagles Hotel in Perthshire, Scotland, in c.1947. She also painted murals for private homes. A photograph of the dining room in a flat in Knightsbridge, London, featuring a mural by MacDermott is illustrated in colour in 'Decorative Art' 1943-48 (p.53); and a photograph of 'Diana and Acteon', a mural painted by Beatrice MacDermott for the drawing-room at Moor Park, Beckwithshaw, Yorkshire, is illustrated in 'Decorative Art' 1951-52 (p.118).