Tech Category

Marc Andreessen

Co-creator of Mosaic web browser and co-founder of Andreessen Horowitz (a16z)

Net Worth: $1.8 Billion

Annual Earnings: $150 Million/yr

Primary Source: Venture Capital (Andreessen Horowitz)

Profile Details

Age	52 (Born July 9, 1971)
Country	United States 🇺🇸

Biography & Deep Dive

Early Life & Background

Marc Lowell Andreessen was born in Cedar Falls, Iowa, and raised in New Lisbon, Wisconsin. Growing up with an early fascination for computers and mathematics, he taught himself programming using a book on BASIC checked out from the local library. His technical aptitude paved the way for him to attend the University of Illinois at Urbana-Champaign, where he pursued a degree in computer science.

Career Milestones

During his undergraduate studies, Andreessen worked at the National Center for Supercomputing Applications (NCSA), where he collaborated with Eric Bina to build Mosaic, widely considered the first graphical web browser that made the World Wide Web accessible to the general public. Following graduation, he moved to California and co-founded Netscape Communications Corporation in 1994. Netscape's immensely successful initial public offering (IPO) in 1995 ignited the dot-com boom and fundamentally transformed global commerce and communication.

Business & Wealth Model

Andreessen transitioned from a pioneering software engineer and serial entrepreneur to one of Silicon Valley's most powerful venture capitalists. In 2009, alongside longtime business partner Ben Horowitz, he founded Andreessen Horowitz (a16z). The firm pioneered a disruptive venture capital model inspired by Hollywood talent agencies, offering specialized operational support in marketing, recruiting, and technical engineering to its portfolio companies. This strategy allowed a16z to capture stakes in hyper-growth startups like Facebook, Airbnb, Stripe, and Coinbase, compounding Andreessen's personal wealth into the billions.

Cultural Legacy

Beyond his financial success, Andreessen has exerted profound influence on modern intellectual and technological discourse. His influential essays on internet economics and technological optimism have shaped the strategic outlook of generations of founders and investors. As a technologist, investor, and public intellectual, his legacy is permanently cemented in the foundational architecture of the modern internet.

Fun Facts

Marc Andreessen was just 22 years old when he co-created the Mosaic web browser.
He was one of the youngest inductees into the Internet Hall of Fame.
He famously wrote the essay 'Why Software Is Eating the World' in 2011, predicting modern tech disruption.

Frequently Asked Questions

What is Marc Andreessen's net worth in 2026?

Marc Andreessen has an estimated net worth of approximately $1.8 billion, largely generated through his venture capital firm Andreessen Horowitz and early tech successes like Netscape.

How did Marc Andreessen make his money?

He accumulated his wealth primarily by co-founding Netscape, which sold to AOL for $4.2 billion, and subsequently building Andreessen Horowitz, one of the world's most successful venture capital firms.

What web browser did Marc Andreessen create?

Marc Andreessen co-created Mosaic while at NCSA, which served as the architectural and conceptual template for the Netscape Navigator browser.

Is Marc Andreessen still involved with a16z?

Yes, he remains an active general partner and co-founder at Andreessen Horowitz, guiding investment strategies across crypto, AI, bio, and enterprise software.