Sébastien Lefebvre

Partner, Elaia
Sébastien Lefebvre, founder of Mesagraph (acquired by Twitter) and former EMEA growth lead at Twitter/X, brings hands-on experience scaling consumer and data products and focuses on AI-native companies.
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Sébastien Lefebvre
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About Sébastien Lefebvre

Sébastien Lefebvre is a Partner at Elaia who founded social TV analytics startup Mesagraph (acquired by Twitter) and then led EMEA growth at Twitter/X before becoming a venture investor, giving him rare hands-on experience scaling consumer and data products. He focuses specifically on AI-native and AI-driven companies, with a portfolio concentrated in applied AI, data infrastructure and developer tooling companies like Giskard, Continuity, Nuclia, Qbeast and Zymvol.

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AI, Deeptech / Hardware, SaaS, Health, Cybersecurity
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Elaia is a venture capital fund that has built its strategy around a Delta triangle of Deep Tech, Early Stage, and Portfolio Management, backed by quantitative back-testing to create a refined portfolio construction model that reduces volatility rather than relying on single mega-winner outcomes. The firm positions itself as unusually math-native for a generalist tech VC, with co-founder Xavier Lazarus betting on an era where mathematicians rule the digital deep tech world, leveraging France's concentration of elite math talent as a structural advantage for deep-tech entrepreneurship.

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