Jared Kaplan moved from theoretical physics into frontier AI, cofounded Anthropic in 2021 and now serves as its chief science officer; Forbes attributes his fortune to an estimated founder stake. [1][2]
From physics to Anthropic
Kaplan trained as a theoretical physicist and became a professor at Johns Hopkins before shifting much of his work toward machine learning. Forbes says he later joined the group of former OpenAI researchers who founded Anthropic in 2021. [1]
Anthropic currently lists Kaplan as cofounder and chief science officer, leading foundational technical research. His fortune is therefore linked to founder ownership created alongside an operating role in a private company, rather than to a disclosed inherited asset base. [2][1]
Founder ownership and private-company value
Forbes's billionaire estimate reflects an inferred founder interest in Anthropic, while the company confirms Kaplan's role but does not publish his personal ownership percentage. That distinction matters because employment and title alone do not establish the economics of his stake. [1][2]
Anthropic raised $65 billion in May 2026 at a $965 billion post-money valuation. The financing provides a company-level valuation reference that can make a founder interest extremely valuable, but it does not disclose Kaplan's dilution, retained percentage or realized liquidity, so the paper value of Anthropic cannot be assigned directly to him. [3][1]
Sources for background
Sources reviewed Sep 15, 2026.
- Jared Kaplan · Forbes · Mar 10, 2026
- Leadership at Anthropic · Anthropic
- Anthropic raises $65B in Series H funding at $965B post-money valuation · Anthropic · May 28, 2026
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