Thomas Gibson founded his eponymous gallery (now run by his son Hugh) in 1969 at the age of 26. He now acts in an advisory capacity under the name Thomas Gibson Art Advisory Services, which was founded in 1996 when Gibson was persuaded to take over the private sales at Christies in an independent capacity. He has sold Pollocks to the National Gallery of Washington, works by Malevich and Magritte to the Tate, and Caravaggios to the National Gallery in London. His clients have included some of the greatest collectors of our time such as Baron Thyssen, the Goulandris family and Stavros Niarchos. When acting for sellers, Gibson says he can advise whether a particular work of art would be best sold privately or at auction.