Just read up on him, and he seems to be a pretty successful and smart guy. From wikepedia:
His first non-technical book,
Fooled by Randomness, about the underestimation of the role of randomness in life, published in 2001, was selected by
Fortune as one of the smartest 75 books known.
[46]
His second non-technical book,
The Black Swan, about unpredictable events, was published in 2007, selling close to 3 million copies (as of February 2011). It spent 36 weeks on the
New York Times Bestseller list,
[47] 17 as hardcover and 19 weeks as paperback,
[18][48] and was translated into 31 languages.
[18] The book has been credited with predicting the banking and economic crisis of 2008.
Essentially calling the 2008 crash puts him ahead of like 99% of ETers I would guess. But elsewhere it did say his overall performance has not been all that great - long periods of relatively dry performance (bull markets) punctuatte by periods of greatness (crashes). I guess that just goes to show that you can't invest/trade as if tomorrow is going to be a black swan event - else over time the bull markets will always prevail in the end and you will be left behind.