Identity:
Edmund Heinemann was a financier and stockbroker and the brother of the publisher William Heinemann.
Life:
He advised both JW and his brother on investment matters. In 1901 he was living at St James West, London.
Bibliography:
UK census 1901; Pennell, Elizabeth Robins, and Joseph Pennell, The Life of James McNeill Whistler, 3rd ed., 2 vols, London and Philadelphia, 1909.