He has written some interesting stuff. In particular, I recommend his book the Black Swan -- it is a very nice description of why there are often structural incentives to disregard unlikely/low-probability events.

But he's also definitely over the hill as a thinker. About the only notable thing he's done in the last few years has been sustaining a long-running and personal feud with Nate Silver (of 538) about who among them better understands probability.