Painter and illustrator, best remembered as an important layout artist and background painter for Warner Brothers cartoons between 1945 and 1964. Prior to that, he had worked as a technical illustrator for Douglas Aircraft in Los Angeles, subsequently joining Disney Studios and then Warner Brothers (where he was primarily associated with the units headed by Chuck Jones and Robert McKimson. Gribbroek was also a noted artists in his own right, member of the "Transcendental Painting Group," based in Taos (New Mexico), a group devoted to "pure abstraction" in art. He went into semi-retirement in 1959 after winning $10,000 in a national cooking contest and spent the last few years of his life in Spain, where he appeared as an actor in films and TV commercials.