Painter and curator, born in Glasgow, where he studied at the School of Art under Maurice Greiffenhagen and Jean Delville, 1906–9, then for a year in Munich. Was married to the artist Josephine Miller. Miller taught at Glasgow School of Art for 20 years from 1910, apart from World War I, then was keeper and deputy director of the National Galleries of Scotland, 1930–52. He also held positions with the Royal Fine Arts Commission, National Buildings Record and Scottish Council. Wrote, especially on military uniforms. Sometimes signing his work H M, he exhibited at RSW, of which he was a member, and RSA, also RA and Royal Glasgow Institute of the Fine Arts. Imperial War Museum and Glasgow Museum and Art Galleries hold his work. Lived for many years in Edinburgh but latterly in Gillingham, Dorset.