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Aleynikov worked for a specific trading desk at Goldman-Sachs, which carries out high frequency strategies in some equity markets. High frequency equity trading is the sub industry I'm referring to. Since you're apparently confused about this: Goldman is a large bank. It has many lines of business, same as Microsoft produces many software products. Some of Goldman's business endeavors fall within the US high frequency equities space, but you'd be making an enormous error of scope if you confused one of their high frequency equities desks with their entire business.

I call shenanigans on the claim that Aleynikov was single handedly running the trading infrastructure for even a single one of their desks. That's complete nonsense.

As for Jim Simons: It's generally believed that the main cause of Renaissance's success is that they have a couple hundred of the world's smartest people all working together. It's not a 'key man' shop at all. (Also: You seem to be suggesting that Simons himself did all the work. The fact is that he spends most of his time smoking cigarettes and handing out wads of cash.)

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