Stock markets are plunging. The price of oil is in turmoil. And hedge funds just came off their worst year since the peak of the financial crisis in 2008. But Adam Sender, a well-known collector of contemporary art who shuttered his hedge fund two years ago, just got back into the game. He is bucking the trend at a time when the establishment of new hedge funds is sharply lower than a year ago, according to the data provider Preqin. It may seem like an odd time to be landing investments for new hedge funds, but a handful of big-name...