Renaissance Technologies is an American quantitative hedge fund founded by mathematician Jim Simons in 1982, known for its Medallion Fund — one of the most profitable investment vehicles in history. The firm gained political significance through co-CEO [[Robert Mercer]] and his daughter [[Rebekah Mercer]], who used their Renaissance-derived fortune to fund [[Breitbart News]], [[Cambridge Analytica]], and a network of [[Dark Money]] organizations shaping [[Republican Party]] politics.