James R. Cargill II
James R. Cargill II (born 1949) is an American heir and philanthropist. Biography. James Ray Cargill II is the great-grandson of William Wallace Cargill, the founder of Cargill. He has a brother, Austen S. Cargill II, and a sister, Marianne Cargill Liebmann. He sits on the Board of the Center of the American West at the University of Colorado at Boulder and on the Board of Trustees of the National Air and Space Museum of the Smithsonian Institution. He has donated to the Spot youth center in Denver, Colorado, the Walker Art Center and the  Minneapolis Institute of Art in Minneapolis, Minnesota. Through the "James R. Cargill II Trust", he has owned stock in SolarAttic, a company that uses solar energy to heat swimming-pools. He lives in Birchwood, Wisconsin and is married with two children. As of 2019, his estimated net worth is US$4.2 billion.