![David Einhorn, president of Greenlight Capital](https://s.wsj.net/public/resources/images/FN-AE099_FN_EIN_M_20180705041807.jpg)
For years, David Einhorn’s investors did not seem to mind his unusual ways — the aloofness toward clients, midday naps, unpopular stock picks, late nights on the town. Until the billionaire hedge fund manager fell into a slump.
After more than a decade of winning on Wall Street, Einhorn’s Greenlight Capital has shrunk to about $5.5bn in assets under management, his investors estimate, from a reported $12bn in 2014, and his investments are struggling.