Walter Greaves - Cheyne Walk, London, UK - Blue Plaques on Waymarking.com

The Tate website has an article about Walter Greaves that tells us:

English painter and etcher. His father was a Chelsea boat-builder who had been J. M. W. Turner's boatman. Greaves and one of his brothers, Henry Greaves (1844–1904), met Whistler in 1863, introducing him to the delights of the Thames, becoming his studio assistants, pupils and close friends for over twenty years. Such early works as Hammersmith Bridge on Boat-race Day (c. 1862; London, Tate) and Old Battersea Bridge (c. 1863; priv. col., see 1984 sale cat., no. 2) show Greaves as a master of primitive art, but his later nocturnes, drawings and etchings demonstrate his absorption of Whistler's teachings. Much of his work also provides a fascinating record of 19th-century Chelsea (e.g. Duke Street, Old Chelsea etching, ?1860–73; London, BM). During the late 1870s Whistler began to gather a more sophisticated group of friends, including Walter Sickert and Mortimer Menpes. Excluded from this circle, Greaves suffered years of neglect, misfortune and poverty before his discovery by William Marchant, proprietor of the Goupil Galleries, who exhibited Greaves's work in his London Gallery in 1911. Greaves's new-found glory was shortlived, however: three weeks after the exhibition opened, Whistler's self-appointed biographers, Joseph and Elizabeth Pennell, sullied his reputation by claiming that he had plagiarised Whistler's work. Despite the admiration of a few fellow painters Greaves again fell into obscurity and spent his last eight years as a Poor Brother of the Charterhouse.