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In 1970, he was offered a visiting professorship at the University of Oregon in Eugene. Gill was at the peak of his career, and very popular in the Pop art scene. But many contemporaries saw a profound and complex sense in his works, expressing more than Pop art originally intended: “Gill is a prominent artist of Pop art, although he is too much a painter and treats its subjects in a very emotionally charged way, than only being regarded as a Pop artist".