Renaissance Technologies

1679.942 - 1710.4 David Rosenthal

And Lenny just happens to be the world expert in a mathematical concept called a Markov model, specifically a version of the Markov model called a hidden Markov model. Now, a Markov model is a statistical concept that's used to model pseudo-random or chaotic situations. Basically, it says, let's abandon any attempt to actually understand what is going on in all of this data that we have.