Gallery: David Koch

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NEW YORK - NOVEMBER 25: Julia Koch and David Koch attend the opening night celebration of the New York City Ballet at David H. Koch Theater, Lincoln Center on November 25, 2008 in New York City. (Photo by Andrew H. Walker/Getty Images)

WASHINGTON, DC - NOVEMBER 04: Americans for Prosperity Foundation chairman and Koch Industries Executive Vice President David H. Koch (C) listens to speakers during the Defending the American Dream Summit at the Washington Convention Center November 4, 2011 in Washington, DC. The conservative political summit is organized by Americans for Prosperity, which was founded with the support of Koch and his brother David H. Koch. (Photo by Chip Somodevilla/Getty Images)

NEW YORK, NY - JANUARY 14: (L-R) Congresswoman Carolyn B. Maloney, Director of The Metropolitan Museum of Art, Thomas P. Campbell, Philanthropist David H. Koch, Chairman of the Board at the Metropolitan Museum of Art, Daniel Brodsky and President of the Metropolitan Museum of Art, Emily K. Rafferty stand in the future site of the new David H. Koch Plaza during the Fifth Avenue Plaza Groundbreaking at the Metropolitan Museum of Art on January 14, 2013 in New York City. (Photo by Astrid Stawiarz/Getty Images)

NEW YORK, NY - MAY 02: David H. Koch accepts the Laureate Award at the Lincoln Center Spring Gala at Alice Tully Hall on May 2, 2017 in New York City. (Photo by Dia Dipasupil/Getty Images for Lincoln Center)

NEW YORK, NY - MAY 17: Philanthropist David H. Koch attends the U.S. Olympic And Paralympic Foundation Event Hosted By Ellen and Daniel Crown on May 17, 2017 in New York City. (Photo by Lars Niki/Getty Images for United States Olympic Committee)