The Fisher Collection of Contemporary Art is widely considered to be one of the most impressive private art collections in the world. Beginning in June 2010, a preview entitled Calder to Warhol: Introducing the Fisher Collection debuts in a major exhibition during a three-month presentation at the San Francisco Museum of Modern Art. Calder to Warhol is culled from the more than 1,100 works collected over four decades by Doris and the late Donald Fisher, founders of Gap.