Ethan Kurzweil has built his reputation around a deep thesis on developer platforms and infrastructure tools, creating structured "commandments" and rules for evaluating these investments that he shares publicly with founders rather than keeping his pattern recognition internal. As Ray Kurzweil's son, he brings a unique futurist-influenced perspective to investing while serving as a bridge between traditional SaaS and Web3, leading Bessemer's early crypto infrastructure moves and focusing on fundamentals-driven investing over token speculation.
What they've been talking about across their social media accounts

- Deep focus on agentic AI within the enterprise. He actively publishes thesis content on concepts like the Selective Autonomy Imperative and predicts that computer-using agents will become a significant infrastructure unlock by 2026.
- Strong support for the revitalization of San Francisco. He engages in local civic efforts, recently hosting Mayor Daniel Lurie to discuss the city's turnaround, public safety, and homelessness alongside organizations like GrowSF.
- Cultivation of community through educational event series. He organizes his firm's Elements series, which brings in diverse speakers ranging from OpenAI executives to Olympic gold medalist Kristen Faulkner to discuss topics like resilience and scaling companies.
- Enthusiasm for the unprecedented speed of the current startup market. He views the current era as the fastest-moving period for startup creation and disruption he has witnessed in his 17 years of investing, particularly regarding the ecosystem forming around major AI platforms.
- Interest in developer tools and the convergence of technical roles. He has backed companies like ComfyUI and Datacurve and predicts that the traditional wall between design and engineering functions is poised to fall.
About their Fund
Sectors
SaaS, Fintech, Consumer, Health, AI
Rounds
Seed - Series B+
Avg Check Size
$500K - $100M
Notable Investments
Bessemer Venture Partners has over 100 years of investing history rooted in the Bessemer steel process, operates without a CEO or central investment committee where any partner can lead deals independently, and publicly shares their internal investment memos, roadmaps, and even their "anti-portfolio" of missed investments as learning tools. The firm runs on a "technology over ego" culture with an apprenticeship model where partners spend years learning alongside senior investors, and they made early contrarian bets on developer-first platforms and AI-native companies backed by quantified roadmaps that predicted major shifts before they became consensus.
Other partners at the fund
Notable Fund
Investments
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