Portrait of Dr. William McNeill Whistler

Painted in 1872 and held at the Art Institute of Chicago, this portrait of Dr. William McNeill Whistler—the artist's brother, a military physician—is a companion to Whistler's portraits of family members that include the famous 'Arrangement in Grey and Black No. 1' (his mother). William McNeill Whistler, who served as a surgeon in various conflicts, is here rendered with his brother's characteristic tonal restraint and formal economy. The work exemplifies Whistler's conviction that portraiture should achieve formal beauty through harmonious arrangement rather than detailed character study.

Whistler renders his brother in a dark coat against a neutral background, following the tonal approach of his other family portraits. The face is painted with careful precision—individualized without being analytically detailed—while the dark formal coat becomes a large tonal mass that anchors the composition. The color range is restricted to warm browns, grays, and blacks consistent with Whistler's tonal philosophy.