James Simons, founder of East Setauket's Renaissance Technologies, pulled down $1.1 billion in 2013, making him the sixth-highest-earning U.S. hedge fund manager and trader, according to a ranking released Wednesday by Forbes.

Although Simons, 75, retired from the $25 billion hedge fund firm in 2010, he still has a hand in the firm, Forbes said.

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The former chair of the mathematics department at Stony Brook University, Simons helped pioneer a quantitative strategy that uses computers to rapidly trade stocks based on momentary inefficiencies in the market.

Topping the Forbes list was hedge fund veteran George Soros, who earned $4 billion.