The recent financial crisis shows even those who claim to understand the math, do not, let alone even being able progress on probability (hmm what are the odds all this could go wrong? Nah).
And another promising new tech goes down the kermit. Shame. And writing a book with the chap from infosys? Yikes, given what we have seen from the warm bodies drafted in as so-called developers from infosys, that cannot be a good sell for the book.
Glad with stuck with the python numerical stack now - far more mature.