Cash Casual: Epstein dresses down. Jeffrey Epstein: International Moneyman of Mystery He's pals with a passel of Nobel Prize—winning scientists, CEOs like Leslie Wexner of the Limited, socialite Ghislaine Maxwell, even Donald Trump. But it wasn't until he flew Bill Clinton, Kevin Spacey, and Chris Tucker to Africa on his private Boeing 727 that the world began to wonder who he is. • By Landon Thomas Jr. He comes with cash to bum, a fleet of airplanes, and a keen eye for the ladies -- to say nothing of a relentless brain that challenges Nobel Prize—winning scientists across the country -- and for financial markets around the world. Ever since the Post's "Page Six" ran an item about the president's late-September visit to Africa with Kevin Spacey and Chris Tucker -- on his new benefactor's customized Boeing 727 -- the question of the day has been: Who in the world is Jeffrey Epstein? It's a life full of question marks. Epstein is said to run $15 billion for wealthy clients, yet aside from Limited founder Leslie Wexner, his client list is a closely held secret. A former Dalton math teacher, he maintains a peripatetic salon of brilliant scientists yet possesses no bachelor's degree. For more than ten years, he's been linked to Manhattan- London society figure Ghislaine Maxwell, daughter of the mysteriously deceased media titan Robert Maxwell, yet he lives the life of a bachelor, logging 600 hours a year in his various planes as he scours the world for investment opportunities. He owns what is said to be Manhattan's largest private house yet runs his business from a 100-acre private island in St. Thomas. Power on Wall Street has generally accrued to those who have made their open bids for it. Soros. Wasserstein. Kravis. Weill. The Sturm and Drang of their successes and failures has been played out in public. Epstein breaks the mold. Most everyone on the Street has heard of him, but nobody seems to know what the hell he is up to. Which is just