PBS
American Masters: Robert Motherwell
Part of the American Masters series by PBS, this site highlights the life and works of Robert Motherwell and includes a picture, timeline of his career, and listing of major works.
Smithsonian Institution
Smithsonian American Art Museum: Robert Motherwell
As part of the Smithsonian Art Museum's database of artists, this site provides biographical information on Robert Motherwell in addition to an extensive listing of his works as displayed at the museum.