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Marc Andreessen

Marc Andreessen

Marc Andreessen is an American entrepreneur, investor, software engineer, and cofounder of venture capital firm Andreessen Horowitz (a16z).


Marc Andreessen is an American entrepreneur, investor, and software engineer. Andreessen rose to prominence in 1994 when he co-created Mosaic, one of the first web browsers. He also cofounded the Netscape Communications Corporation. Along with Ben Horowitz, he is the cofounder of venture capital firm Andreesen Horowitz, also known as a16z.

Early life and education

Marc Andreessen was born on July 9, 1971, in Cedar Falls, Iowa, US. As a child, Andreessen taught himself BASIC, a programming language, so he could design his own computer games. Initially planning on being an electrical engineer, Andreessen changed his career path after being admitted into the University of Illinois at Champaign-Urbana and getting a part-time job at the school's computer lab, the National Center for Supercomputing Applications (NCSA). Andreessen graduated from the university in 1993 with a degree in computer science.


While at the University of Illinois, Andressen and his peers at the NCSA co-authored Mosaic, an early internet browser designed to be user-friendly and non-technical. Mosaic became widely popular after it was available as a free download by the NCSA. Shortly after leaving the university, Andreessen moved to Silicon Valley, where he met Jason Clark, the founder and former president of Silicon Graphics, Inc. In April 1994, the two founded Mosaic Communications, later renamed the Netscape Communications Company. The company was sold to AOL in November 1998 for $4.2 billion.

Andreessen later founded and sold the software company LoudCloud, renamed Opsware, in 1999. It was acquired by Hewlett-Packard in 2007 for $1.6 billion. Andreessen also cofounded Ning, a company that provides a platform for social networking websites, with Gina Bianchini in 2005. The company was acquired by Glam Media in 2011 for $150 million.

In 2009, Andreessen and Ben Horowitz founded venture capital firm Andreessen Horowitz (a16z), where he also serves as general partner. The company is stage agnostic and invests in seed- and late-stage technology companies in the consumer, enterprise, bio/healthcare, crypto, and fintech spaces. a16z has $19.2 billion in assets under management across multiple funds, which include $1.4 billion in Bio funds, $3.1 billion in crypto funds, and the Cultural Leadership Fund. As of 2021, the firm has made over 1,000 investments, acting as lead investor in 444 of them, and 179 exits.

Andreessen is also a board member of several Andreessen Horowitz portfolio companies: Applied Intuition, Carta, Dialpad, Honor, OpenGov, and Samsara. He is on the board of Facebook and served on the board of Hewlett-Packard from 2008 to 2018.


Andreessen leaves the board of Hewlett-Packard.
Ning is acquired by Glam Media for $150 million.
Andreessen and Ben Horowitz Andreessen Horowitz, also known as a16z, a stage agnostic venture capital firm.
Andreessen joins the board of Hewlett-Packard.
Hewlett-Packard buys Opsware for $1.6 billion.
Andreessen and Gina Bianchini found Ning, a social networking website.
Andreessen founds the software company LoudCloud, later renamed Opsware.
November 1998
Netscape is sold to AOL for $4.2 billion.
April 1994
Andreessen, along with Jason Clark, cofound the Netscape Communications Company.
Marc Andreessen graduates from the University of Illinois at Champaign-Urbana with a bachelor's degree in computer science.

Invested in


Further Resources


Applied Intuition Series C - Andreessen Horowitz

Marc Andreessen


October 22, 2020

Bio Eats World: It's Time to Build in Healthcare--COVID 19, Innovation, and What Comes Next - Andreessen Horowitz


October 26, 2020

Marc Andreessen On Productivity, Scheduling, Reading Habits, Work, and More - Andreessen Horowitz

Marc Andreessen and Sriram Krishnan


September 7, 2020


Dominic Rushe in New York
August 1, 2021
the Guardian
Amazon, Google, Apple and Microsoft all reported record-breaking profits but recent Biden administration moves suggest US tech's easy ride is over
February 16, 2021
The Indian Express
The Clubhouse app, which lets people gather in audio chat rooms to discuss different topics, has been downloaded nearly 4 million times in the last month alone, according to Apptopia.
Candy Cheng
February 6, 2021
Business Insider
Andreessen and Horowitz are the cofounders of a major Silicon Valley venture firm which is an investor in Clubhouse, the buzzy audio chat app.
Alexei Oreskovic
January 13, 2021
Business Insider
In this week's Insider Tech newsletter we look at the battle over free speech that's put Twitter and Facebook in the spotlight.
Christine Hall
December 29, 2020
Crunchbase News
Smerklo spoke about his journey, what his children really think he does for a living, and how he pays his knowledge forward to the next generation of entrepreneurs.


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