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Marc Andreessen

Co-founder & general partner, a16z

Marc Andreessen is a co-founder and general partner of Andreessen Horowitz. His software career began with the NCSA team behind Mosaic and continued through Netscape and Loudcloud, which became Opsware. He later moved into venture investing with Ben Horowitz. His public writing addresses software, AI and technological progress, alongside board work with companies including Meta.

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At a glance

Marc Andreessen is a co-founder and general partner of Andreessen Horowitz. His software career began with the NCSA team behind Mosaic and continued through Netscape and Loudcloud, which became Opsware. He later moved into venture investing with Ben Horowitz. His public writing addresses software, AI and technological progress, alongside board work with companies including Meta.

Current role
Co-founder and general partner, Andreessen Horowitz
Education
University of Illinois Urbana–Champaign — BS in computer science
Known for
Mosaic; Netscape; Loudcloud / Opsware; a16z
Previously
Software entrepreneur and Netscape co-founder
Coverage
Venture capital; software; AI; technology policy

Sources checked . Selected career background and milestones.

Career, in context.

Selected research, leadership and career milestones, newest first.

  1. Publishes The Techno-Optimist Manifesto

    Andreessen publishes an essay arguing for technology, economic growth and innovation. It offers a direct source for his position on AI and technological progress.

    Source: Andreessen Horowitz ↗

  2. Co-founds Andreessen Horowitz

    Andreessen and Ben Horowitz establish their venture capital firm, bringing their experience as software founders to investing in and supporting technology companies across stages.

    Source: Andreessen Horowitz ↗

  3. HP agrees to acquire Opsware

    Hewlett-Packard announces an agreement to buy the infrastructure-software company. Andreessen’s accompanying founder account describes its evolution from Loudcloud into data-center automation software.

    Source: HP announcement filed with SEC ↗

  4. Co-founds Loudcloud

    Andreessen and colleagues establish Loudcloud to automate large-scale computing infrastructure. After the internet downturn, the business sells its managed-services operation and becomes software company Opsware.

    Source: Andreessen founder account filed with SEC ↗

  5. Co-founds Netscape

    Andreessen helps establish the commercial browser company after working on Mosaic. A corporate proxy records Netscape’s April 1994 founding and his subsequent product-leadership responsibilities.

    Source: SEC corporate proxy ↗

  6. Co-creates Mosaic with the NCSA team

    At the University of Illinois, Andreessen works with Eric Bina and other NCSA contributors on Mosaic, helping make graphical browsing accessible to a broader internet audience.

    Source: University of Illinois ↗

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