Dr. David Shaw’s quant king throne rests on a net worth of $5.5 billion, according to Forbes- all thanks to one of Wall Street’s esteemed quant hedge fund firms, D. E. Shaw & Co. The math wizard’s claim to fame: quant trading before it became a brilliant go-to method for investing. It takes a wise billionaire to know how to stir up Wall Street and change the name of the game to quant, with…