Byzantinist and baroque scholar, architectural historian; Director of Institute of Fine Art, New York University. Krautheimer was the son of Nathan Krautheimer (1854-1910) and Martha Landman (Krautheimer) (1875-1967). His cousin was Ernst Kitzinger who also became an eminent medievalist art historian. As a young man, Krautheimer enlisted in the (German) army in the First World War and saw serious war service (1916-1918).