Biography
Marc Andreessen was born July 9, 1971 in Cedar Falls, Iowa and grew up in New Lisbon, Wisconsin. He studied computer science at the University of Illinois at Urbana-Champaign, where in 1993 — at age 22 — he co-created Mosaic, the first graphical web browser, with Eric Bina at the National Center for Supercomputing Applications (NCSA). Mosaic made the World Wide Web accessible to ordinary people: it displayed images inline with text, supported multiple internet protocols, and ran on Windows. Before Mosaic, the web was text-only and used by academics. After Mosaic, it was visual, intuitive, and grew at 341,000% annually.
He co-founded Netscape in 1994. Netscape Navigator captured 80% of the browser market within a year. The company IPO'd in August 1995 — Andreessen was 24, and the IPO is widely considered the starting gun of the commercial internet era. After Netscape was acquired by AOL, he co-founded Loudcloud (later Opsware, sold to HP for $1.6B), then in 2009 co-founded Andreessen Horowitz (a16z) with Ben Horowitz. A16z became one of the most influential venture capital firms in Silicon Valley, with $35B+ AUM, backing Facebook, Twitter, GitHub, Airbnb, Lyft, Coinbase, and hundreds more.
Core Philosophy
Software is eating the world. In his landmark 2011 Wall Street Journal essay, Andreessen argued that software companies were disrupting every major industry — finance, retail, media, transportation, healthcare — and that incumbents who failed to become software companies would be displaced by those who did. This thesis has proven more accurate than almost any other technology prediction of the past 20 years. Amazon ate retail, Netflix ate video, Uber ate taxis, Airbnb ate hotels, Stripe ate payments.
Contrarianism as competitive advantage. Andreessen's investment philosophy at a16z is rooted in finding ideas that look wrong to the consensus but are actually right. "The best ideas look crazy at first." He has championed cryptocurrency, AI, and biotech when mainstream opinion was skeptical. He invests in founders who have unique, non-consensus insights about where the world is going — and the conviction to act on those insights against resistance.
Famous Quotes
"Software is eating the world."— Marc Andreessen, Wall Street Journal, 2011
"The best ideas look crazy at first. And then they look obvious in retrospect."— Marc Andreessen
"The thing I have noticed is that when the anecdotes and the data disagree, the anecdotes are usually right."— Marc Andreessen
"In a startup, nothing is proven. You have to be willing to run your own experiment."— Marc Andreessen
Notable Achievements
- Co-created Mosaic (1993) at age 22 — the first graphical web browser, making the internet accessible to billions
- Co-founded Netscape (1994); Navigator captured 80% browser market share within 12 months
- Netscape IPO (1995) — the starting gun of the commercial internet era; Andreessen was 24
- Co-founded Loudcloud/Opsware; sold to HP for $1.6B
- Co-founded Andreessen Horowitz (a16z) in 2009 with $300M; grew to $35B+ AUM
- A16z backed: Facebook, Twitter, GitHub (acquired by Microsoft $7.5B), Airbnb, Lyft, Coinbase, Stripe
- Named to Time's 100 Most Influential People; MIT Technology Review Innovators Under 35
- "Software Is Eating the World" essay widely cited as the most prescient tech essay of the 2010s
Lessons for the Executive Suite
The most valuable insights are ones most people believe are wrong. If your strategy looks obvious to everyone, the opportunity has already been competed away.
Andreessen's 2011 thesis is now baseline reality. The question is not whether software will transform your industry but whether you will lead that transformation or be displaced by it.
Mosaic in 1993, Netscape in 1994, a16z in 2009 — Andreessen consistently positioned ahead of waves. Early positioning in a genuine trend yields enormous asymmetric returns.
When your frontline data (anecdotes) conflicts with your aggregate data, investigate the anecdotes. They capture what the averages smooth away — and often predict what the averages will show next quarter.