The 32-year-old CEO of a $2 billion startup says he and his cofounder are driven by paranoia

Nat Turner met Zach Weinberg on their first day of school as undergrads at Wharton, in a class known for being the easiest way to fulfill the writing requirement. That was 2004, and it was the start of a business partnership that would see an $80-million deal to Google in 2010 and a $1.9-billion deal in February for their current venture, Flatiron Health.

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