Identity:
C. J. Harrison lived at 6 Swan Walk, Chelsea, and was thus a near neighbour of Whistler during his last years.
Life:
JW certainly called him in urgently when he wanted help (see, for instance, #07536). However, little is known of their relationship, and Whistler seems to have consulted a nyumber of doctors, as the fancy took him.
Bibliography:
Kelly's London Postal Directory, London.