Market Wizards by Jack Schwager originally profiled Steinhardt. Here is an excerpt from their interview:

Q. How did you get started as a fund trader?
A. When I first got into this business in the late 1960s, I only had an analytical background. I was an agricultural equipment and cyclical goods analyst at Loeb Rhoades. My business was started with two other fellows who were also analysts. As our business grew, trading became more important. I became the trader from the firm, having had very little trading background.

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