Painter, 17th baronet, son of Hervey Lodge de Montmorency and husband of the artist and stained glass design Rachel de Montmorency. He was educated at Dover College and then at Dover School of Art, 1910-11 the Byam Shaw and Vicat Cole School of Art, 1912-13 and at the RA Schools, 1914-15.
De Montmorency served in the Army during World War I, (1915-19) following which he worked for many years as a portrait painter.
He exhibited at the RA, RBA, Walker's Gallery and Cooling Gallery, ROI and at the National Gallery, London. He was elected RBA in 1935, acting as an honorary librarian in the mid-1940's.
A portrait by him is in the GAC.
A portrait of Tom J. Davies, a workman at the copper works in Swansea, which is by de Montmorency and was painted for an advertisement for Imperial Chemical Industries (ICI). It is illustrated in the July 1945 issue of Art and Industry. Examples of his work are held by the GAC, IWM, Leighton House Museum and at the Battersea Arts Centre.