NAIEL IQBAL’S co-workers couldn’t figure him out. Ms. Jukaku, a former analyst at Goldman Sachs, prayed in her Manhattan apartment. He’d just started at a Midtown Manhattan hedge fund — the kind of elite enclave where overachievers in button-downs go to make a few hundred grand before heading off to Harvard Business School. But Mr. Iqbal, 27, a graduate of the Wharton School, wasn’t acting like a typical finance guy. He didn’t introduce himself around the office. Nor did he grab lunch with the other traders.