download the appSign up to get the inside scoop on today’s biggest stories in markets, tech, and business — delivered daily. Read previewIn 1996, David Einhorn founded Greenlight with less than $1 million in capital — a good chunk of which came from his parents — at the precocious age of 27. And now the 55-year-old is dealing with something he once was: a thorn in the side. Fishback sued his old firm for defamation in October, which is now in arbitration, according to a person familiar with the case. Thursday, Fishback said he was invited to debate Tesla with his old boss, saying Einhorn didn't understand Musk's company's "core value driver" of autonomy.

---

Persons: —, David Einhorn, sayer, sneering, Elon Musk, Einhorn, He's, year's Sohn, James Fishback, Fishback's, Fishback, Greenlight, Pharma Bro, Martin Shkreli, — Fishback, Tesla, Fishback —, Free Press —, I'm Organizations: Service, Business, Lehman Brothers, Allied, Tesla, Pharma, Free Press Locations: —, New York, Bari