Summary List PlacementIn high school, Ryan Tolkin was trading securities at a billionaire's family office. In college, he was presenting his volatility research to a global asset manager. Now, at 34, the Long Island native is running the $8.8 billion hedge fund Schonfeld Strategic Advisors as its chief executive and chief investment officer. How he got to his lofty perch is a combination of natural ability and extreme focus and discipline, said those who know him best.