F elix Baker, along with his brother Julian, is an American billionaire who co-founded Baker Bros. Advisors, one of the most successful and influential biotechnology-focused hedge funds in the world. Felix's deep scientific background, including a PhD in immunology from Stanford, has provided the firm with a unique and powerful edge in the high-stakes world of biotech investing.

The Baker brothers founded their firm in 2000 and have built a formidable reputation for their deep, research-driven approach. They are known for making large, long-term, and highly concentrated investments in promising biotech companies. One of their most legendary successes was their massive and long-held stake in the cancer drug developer Seagen (formerly Seattle Genetics), which was acquired by Pfizer for $43 billion. This and other successful bets have generated phenomenal returns and turned their fund into a multi-billion dollar powerhouse.