Dr Darrach was resident physician at the University of Pennsylvania Hospital, Philadelphia.
Darrach was a member of the Pathological society and of the Philadelphia Academy of Natural Science; a fellow of the College of Physicians; in charge of the hospital of the Guyler US hospital at Germantown. He married Sarah Morris. AMW's son William McNeill Whistler studied with him in Philadelphia (see Head of a monk (M.218); Heads of a man and woman, and a cloaked figure (M.1455)).
Johnson, Rossiter (ed.,), The Twentieth Century Biographical Dictionary of Notable Americans, 10 vols., Boston, 1904, vol. 3; Young, Andrew McLaren, Margaret F. MacDonald, Robin Spencer and Hamish Miles, The Paintings of James McNeill Whistler, New Haven and London, 1980; MacDonald, Margaret F., James McNeill Whistler. Drawings, Pastels and Watercolours. A Catalogue Raisonné, New Haven and London, 1995.