Poolside CEOs Jason Warner and Eiso Kant: Email, LinkedIn and Bio (2026)

Poolside’s co-CEOs at a glance

Their nationalities and countries of residence are from Poolside’s UK company filings (Companies House). Both lead Poolside’s subsidiaries in the UK, France and Switzerland.

Poolside CEO email address: how to reach Jason Warner and Eiso Kant

Neither co-CEO publishes an email address: their X bios, LinkedIn profiles and GitHub accounts list none (checked Nov 5, 2026). For press, Poolside’s inbox is press@poolside.ai (Poolside). Both post regularly on X, Kant most often.

Poolside email address pattern

Poolside staff use {first}@poolside.ai, according to Prospeo (Prospeo) and Poolside’s own code.

Before emailing any pattern-based address, run it through a verifier: a bounce hurts deliverability for every later send. All Poolside patterns and official inboxes are on the Poolside email format page.

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Career timeline

How Warner and Kant started Poolside

“The poolside story starts at GitHub, because I met my co founder when I tried to acquire his company to become the AI inside of GitHub,” Warner says. “It didn’t work out from an acquisition perspective, but he and I became great friends” (Penn State). They later co-hosted an engineering-leadership podcast, and founded Poolside in 2023 to go “after narrow AGI through software and code” (Newcomer). The name came by accident: they had planned to call it Snowball, until Amazon’s trademark got in the way, and Warner’s “credit card still says snowball” (Penn State).

Jason Warner

Warner grew up in Connecticut and got into computers through a high-school placement at IBM (Penn State). After Penn State and RPI he worked at the anti-fraud startup 41st Parameter, Canonical and Heroku, then spent four years as GitHub’s CTO, before and after Microsoft bought it, and two years as a venture capitalist at Redpoint (SEC). He lives in Canada.

Eiso Kant

Kant, who is Dutch, started companies young: at 22 he was a final-year student at IE University in Madrid running Tyba, a recruiting startup (IE University). In 2015 he co-founded source{d}, which applied AI to source code, and in 2019 founded Athenian (SEC). He lives in Portugal and also runs Poolside Infrastructure Company, which is building Project Horizon (PIC).

In their own words

“We are an American company with a global team and global aspirations.”

— Eiso Kant, post on X, April 30, 2026 (X)

“I believe intelligence should and will become a commodity. The question is whether that intelligence comes from three companies, or from many people who can build it, own it, and shape it.”

— Eiso Kant, post on X, July 21, 2026 (X)

“We didn’t believe you could just fine-tune your way to general intelligence.”

— Eiso Kant, RAAIS conference, 2025 (Air Street Press)

“…a truly open, a smidge off the frontier AI, from an American company, that literally never gives up until it solves your problem.”

— Jason Warner, post on X, July 21, 2026 (X)

“If you’re one of those people, if you want to take one side of the fence, you’re a printing press for cash unlike anything we’ve ever seen in the world.”

— Jason Warner on foundation-model companies, HumanX, March 2025 (TechCrunch)

Poolside’s leadership

Full company profile, including the Nvidia deal: Poolside in 2026: revenue, valuation, funding, CEO.