From 1938 to 1940 he was the chief art critic for The Studio. He published several books on art and artists, including Jack B. Yeats: An Appreciation and an Interpretation (on Jack Butler Yeats) and Pictures in the Irish National Gallery (both 1945), and Nicolas Poussin (1960) on Nicholas Poussin. He was director of the National Gallery of Ireland from 1950–1963.