Exclusive: Ineffable Intelligence adds six ‘cofounders,’ hiring veterans from Google DeepMind, InstaDeep and venture firm Flying Fish

Ineffable Intelligence , the London-based AI startup launched earlier this year by ex-Google DeepMind AI researcher David Silver, has brought on six high-profile “cofounders.” Four of the new Ineffable hires are former Google DeepMind colleagues of Silver’s: Chris Apps, Wojciech Czarnecki, Lasse Espeholt, and Junhyuk Oh.

Apps, Czarnecki, and Oh worked with Silver on DeepMind’s 2019 AlphaStar breakthrough.

AlphaStar was an AI system that could beat the world’s best human players at the competitive, real-time strategy video game Starcraft II.

Meanwhile, Espeholt helped build Google’s MetNet weather prediction AI models.

The fifth cofounder, Alexandre Laterre, was formerly the head of research at London-based AI company InstaDeep, which was acquired by biotech company BioNTech in 2023.

The sixth, Heather Gorham, had been a partner at the venture capital firm Flying Fish, which was among the first investors in Ineffable.

All six cofounders recently updated their LinkedIn profiles to reflect their new roles.

Ineffable confirmed the hires, but declined to comment further.

In April, Ineffable was valued at $5 billion when it raised a $1.1 billion seed round of venture capital funding, the largest seed investment ever in Europe.

Ineffable’s hiring spree adds to the wave of high-profile researchers who have recently left Google DeepMind to join rival AI companies and contributed to a perception that DeepMind, which was the first company to make the creation of AI models that could rival or exceed human intelligence its primary mission, is now struggling.

When Ineffable was incorporated in November 2025, records at U.K. business registry Companies House show that the company was set up by George “Geordie” Rose, a Canadian serial entrepreneur and tech investor.

Silver only became a company director in January 2026, after he officially left DeepMind.

Companies House records show that one month later, Rose was no longer a “person with significant control” of Ineffable’s shares, and he stepped down as a director in July.

Rose’s LinkedIn profile and his web page list his as a “founding advisor” to the company.