The hedge fund billionaire tells CNBC the past 12 months were the "worst period of performance" of his career, and the implosion of Valeant was mostly to blame.
'It was very painful'.
Lunch was a bit awkward. It was around 1 p.m. on a warm October day in New York.
Put this in the category of, if you can’t say something nice, don’t write it in an e-mail.