I normally wouldn’t raise it if I couldn’t independently verify it happened myself, but this person is one of the nicest people I’ve ever met, so I totally believe it. They left a very cushy job to take a job at Wealthfront, so leaving after a few months had to take something pretty substantive.
Wealthfront isn't a very large company so if you are telling the truth you have potentially given enough information about your friend for people there to identify him/her.