He is a data scientist. Not a quant trader nor trading system developer. In each hedge fund, bank or hft firm there are a number of guys who have not an inkling of knowledge of brokers and broker apis. Jeff possesses a lot of domain knowledge and that is what his employer hired him for. Does that make it clearer?
And most of his former startups did not turn a dime else he would not be toiling at a hedge fund as a salaried guy.
And most of his former startups did not turn a dime else he would not be toiling at a hedge fund as a salaried guy.
Uhhh, he works at Citadel. Maybe you've heard of them? BTW a friend ran into him at the New York R Conference last week and reports he's still maintaining at least some of his R packages.