Ben Bernanke, former chairman of the U.S. Federal Reserve, will serve as a senior adviser with hedge fund Citadel Investment Group
http://www.marketwatch.com/story/bernanke-signs-on-as-advisor-at-citadel-nyt-2015-04-16
http://www.marketwatch.com/story/bernanke-signs-on-as-advisor-at-citadel-nyt-2015-04-16