American heiress and billionaire Pauline MacMillan Keinath has an estimated net worth of $5.5 billion as of April 2016, according to Bloomberg. She is best associated with the Cargill family, who owns U.S.' largest privately held company, Cargill Inc. It was founded by her great grandfather William W. Cargill in Iowa right after the Civil War. Pauline MacMillan Keinath was born on July 31, 1934 in Hennepin County, Minnesota. Currently based in St. Louis Missouri, Pauline MacMillan Keinath is currently married with four children. Pauline MacMillan Keinath is one of the secretive billionaire heiress of Cargill Inc.

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Today, the company remains to be mostly owned by the family. As of 2012, Cargill has earned a total revenue of $134 billion from its diverse divisions which include commodity trading, cattle, crops as well as risk management. Since the taking over of William W. Cargill's son in law John MacMillan in 1909, the company's CEO has always been a member of the family but only until 1995.