Ken Griffin's Hand-Picked Math Prodigy Runs Market-Making Empire; Citadel Securities CEO Peng Zhao left for college at age 14, caught Griffin's eye early in his career and built systems now mopping up market share Katherine Doherty - Bloomberg Among all the tales Wall Street leaders tell of pivotal moments that led them to their powerful perches, Citadel Securities Chief Executive Officer Peng Zhao's may be the only one that involves sifting through trash. It starts with youthful hubris and ends as a parable about perseverance - something the firm will need to realize its ambitions amid a slew of proposed US regulations. /jlne.ws/3LNIoV2