George David Thompson was an American investment banker, industrialist, and modern art collector, based in Pittsburgh. He started as a banker, but by 1945 was running four steel mills. In 1959 Pittsburgh's Carnegie Museum of Art rejected his offer of over 600 artworks, unwilling to build a gallery bearing his name, and he gradually sold much of his collection, including 88 works by Paul Klee and 70 by Alberto Giacometti, although he left the Carnegie Museum over 100 artworks when he died in 1965.