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Ken Griffin is a hedge fund manager and the founder and CEO of Citadel. His wife Anne is the founder of Aragon Global Management. Ken was acknowledged at the privately held Koch seminar in June 2011 in Vail, Colorado for donating at least $1 million to Koch-related causes.  He also attended the February 2014 Koch seminar in Palm Springs, California.
- Gavin Aronsen, Exclusive: The Koch Brothers' Million-Dollar Donor Club, Mother Jones, September 6, 2011
- Andy Kroll and Daniel Schulman, "The Koch Brothers Left a Confidential Document at Their Donor Conference," Mother Jones, February 5, 2014.