I have a Ph.D. in mathematics.
Have you tried the banks? In particular, the derivative departments. Age is probably against you (I think you're mid-30s? They're ageist bastards as well as everything else), but if you find a good technical house and show up with good diff eqn skills and programming ability, it may swing it.
ABE: I'm so long outside this line of work, it may be that everything is now Monte Carlo - so MC programming and knowledge would be the key.
Edited by cavediver, : No reason given.