The “quant king” pioneered an approach that has become a pillar of financeGreat investors are often known by a signature style. Warren Buffett made it big by investing in companies he thought cheap and holding on for many years. George Soros bet on macroeconomic events, at one point almost breaking the Bank of England. Jim Simons, who died on May 10th at the age of 86, was more mysterious. He plumbed the quantitative depths in often unexplainable ways.He may also have been the best of the lot. “...