Jonathan Hsu is a PhD string theorist turned venture capitalist who led Facebook's data science organization from a handful of people to over 150 and created widely-used growth analytics frameworks before moving into investing. At Tribe Capital, he built the Magic 8-Ball system that analyzes raw product data to measure product-market fit across different business models, and routinely provides founders with detailed analytical audits of their growth and retention metrics even when passing on investments. Jonathan Hsu is a PhD string theorist turned venture capitalist who led Facebook's data science organization from a handful of people to over 150 and created widely-used growth analytics frameworks before moving into investing. At Tribe Capital, he built the Magic 8-Ball system that analyzes raw product data to measure product-market fit across different business models, and routinely provides founders with detailed analytical audits of their growth and retention metrics even when passing on investments.