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Portrait of Marc Andreessen

Marc Andreessen

Co-Founder & General Partner at Andreessen Horowitz

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Biography

Co-founder and general partner of Andreessen Horowitz (a16z). Created the first widely used web browser (Mosaic/Netscape). A prolific AI investor and author of the influential Techno-Optimist Manifesto, arguing against AI regulation.

JustSaid Take EDITORIAL
OUR READ

Andreessen has positioned himself as the intellectual godfather of AI acceleration and the loudest opponent of safety regulation — a stance that conveniently aligns with a16z's massive AI portfolio. The Techno-Optimist Manifesto was less a philosophical document than a political declaration: AI regulation is bad, safety concerns are incumbent protectionism, and the US must build without restraint. His American Dynamism practice betting on defense AI is the logical endpoint — if you believe AI is unconditionally good, pointing it at national security is a feature, not a risk. The question is whether his influence accelerates the technology faster than institutions can adapt to it.

Updated May 2026
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Affiliations 3 organizations
Andreessen Horowitz
Co-Founder & General Partner
CURRENT
Netscape
Co-Founder
FORMER
Opsware
Co-Founder
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