Whistler

About author:

James Abbott McNeill Whistler (July 10, 1834 – July 17, 1903) was an American-born, British-based artist. Averse to sentimentality and moral allusion in painting, he was a leading proponent of the credo "art for art's sake". His famous signature for his paintings was in the shape of a stylized butterfly possessing a long stinger for a tail.

Reference
http://en.wikipedia.org/wiki/James_Abbott_McNeill_Whistler