Throughout the latter half of the 20th century, Thomson distinguished himself as one of North America's leading art collectors. In the 1940s, he began collecting paintings by
Cornelius Krieghoff. In 1989, Thomson opened an eponymous Gallery in downtown Toronto to display some of these pieces. The collection features essential works of over a dozen eminent 19th to mid-20th century
Canadian artists, including some three hundred paintings from
Tom Thomson (no relation) and the
Group of Seven, a hundred and forty-five wintry
habitant scenes by
Cornelius Krieghoff, a hundred mostly impressionistic, modern landscapes by luminary
David Milne, as well as works by
Paul Kane,
Paul-Emile Borduas and
William Kurelek. The lesser-known European Collection includes an assortment of 17th to 20th century British ship models, a series of Medieval and Baroque
ivory carvings, and features the 12th-century
Malmesbury châsse, an ornate casket which once held the bones of a Scottish missionary. The unprecedented donation of his CA$300 million art collection helped lure Toronto-native
starchitect Frank Gehry to design a major expansion and renovation of the
AGO, towards which Thomson gave an additional CA$50 million. He also gifted a CA$20 million endowment for gallery operations. ==Retirement==