According to Wikipedia,
Sam Gilliam was an American color field painter and lyrical abstractionist artist. Gilliam was associated with the Washington Color School, a group of Washington, D.C.-area artists that developed a form of abstract art from color field painting in the 1950s and 1960s. His works have also been described as belonging to abstract expressionism and lyrical abstraction. He worked on stretched, draped and wrapped canvas, and added sculptural 3D elements. He was recognized as the first artist to introduce the idea of a draped, painted canvas hanging without stretcher bars around 1965. This was a major contribution to the Color Field School and has had a lasting impact on the contemporary art canon. Arne Glimcher, Gilliam's art dealer at Pace Gallery, wrote following his death that "His experiments with color and surface are right up there with the achievements of Rothko and Pollock."
Sam Gilliam is affiliated with the following schools: