Gwendolyn Sontheim Meyer (born 1961/62) is an American billionaire heiress and equestrian.Juli Weiner, America’s Poor: Mitt Romney Does Not Make Forbes 400 List , Vanity Fair, September 19, 2012
Biography Early life She is a great-great-granddaughter of William Wallace Cargill, the founder of Cargill. Her late mother was Marion MacMillan Pictet.Brian Solomon, The Secretive Cargill Billionaires And Their Family Tree, Forbes, 9/22/2011
Career A show jumper, she won the Prix Credit Suisse at the Geneva International Horse Show in 2011. She also sponsors dressage.Winci Acquired for Guenter Seidel to Ride, Eurodressage, 01/01/2013Off Centerline, Sidelines, January 17, 2013
Personal life She lives in Rancho Santa Fe, California.Lindsay Berreth, Seidel Gets New Grand Prix Ride, The Chronicle of the Horse, January 3, 2013 She is divorced and has two children. As of February 2026, she was estimated to be worth approximately US$5.6 billion.
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