D.E. Shaw
http://www.deshaw.com/
The D. E. Shaw is one of the world's largest hedge funds.
The D. E. Shaw has more than 1,300 employees; approximately $35 billion in aggregate investment capital as of November 1, 2007; and offices in North America, Europe, and Asia.
DE Shaw is know for its quantitative strategies - those using mathematical techniques to identify profit opportunities - but also uses qualitative strategies- based on the identification of profit opportunities by human experts.
The D.E. Shaw Group Sas founded by David E. Shaw in 1988. He continues to serve as chairman and CEO.