James Whistler was an American-born artist who founded the Tonalism art movement in the 1880s. Tonalism was influenced by the Barbizon school and featured landscapes painted in dark, neutral colors like gray, brown, and blue that emphasized tone and mood. Some of Whistler's most famous works from different periods of his career include Portrait of Whistler with Hat from his art study days in Paris, Symphony in White, No. 1: The White Girl from his early career, several "Moonlight" nocturne paintings, and the iconic Arrangement in Grey and Black No. 1, also known as Whistler's Mother, from his mature period.