Allan was born and raised in Glasgow, the daughter of William Allan and Margaret Young.[4] She was educated at the University of St Andrews, graduating with a "Lady Literate in Arts" (LLA) degree in 1894 (before women were allowed to earn standard degrees at the university).[3] She became principal of Homerton College, Cambridge in 1903.[5] She appointed female lecturers, and became the first female president of the Training College Association in 1916.[6] She retired from Homerton in 1935.[3][7]
Death
Mary Miller Allan died in 1947 in Cambridge. There is a Mary Allan Building at Cambridge, named in her memory.[8] A 1919 portrait of Allan, by Hugh Goldwin Rivière, is in the college's collection.[1]