Wall Street financier Chirayu Rana, the anonymous ‘John Doe’ who filed a sensational—and fiercely disputed— sexual harassment lawsuit against a JPMorgan Chase executive has left investment firm Bregal Sagemount, senior company sources have told The Post. The 35-year-old principal’s biography remained on the Gene Yoon-led firm’s website on Friday morning, but this outlet can reveal he abruptly left on April 2, just over three weeks before he accused Lorna Hajdini, 37, of drugging him and keeping