Renaissance Technologies, which employs dozens of math and physics doctorate-
According to Forbes, Robert Mercer earned USD 150 million in 2015, USD 115 million in 2013, USD 90 million in 2012 and 125 million in 2011. He is one of the highest earning hedge fund managers. Mercer’s career started at IBM were he was working on a speech recognition program. In 1993 he joined Renaissance Technologies. When James Simons retired, Mercer took over as CEO.
Mercer Mercer was "the biggest single donor" in the 2016 U.S. presidential race, donating US$ 14 million to the 2016 presidential campaign of Ted Cruz. In total Mercer has donated more than US$ 35 million to political campaigns.
Robert Mercer has a net worth of more than USD 400 million. In this article on Bloomberg his net worth is estimated to be near US$ 1 billion.
He is an active philanthropist, donating USD 13.5 million in 2013 through his Mercer Family Foundation, which is run by his daughter Rebekah Mercer. The foundation has US$ 37 million in assets.
Mercer owns a large house in Head of the Harbour, Long Island, New York. The house is named Owl’s Nest, and has an estimated value of more than US$ 18 million.