Marc Andreessen

Marc Andreessen
Marc Andreessen
Born	Marc Lowell Andreessen; July 9, 1971 (age 55); Cedar Falls, Iowa, U.S.
Occupation(s)	Entrepreneur, venture capitalist, software developer
Years active	1993–present
Known for	Co-creator of Mosaic, co-founder of Netscape, co-founder of Andreessen Horowitz, co-founder of Opsware, founder of Ning
Notable work	Mosaic web browser, Netscape Navigator

Marc Lowell Andreessen ( ; born July 9, 1971) is a prominent American entrepreneur, venture capitalist, and former software developer. He played a key role in creating Mosaic, the pioneering web browser that first incorporated inline images; co-founded Netscape; and established the Silicon Valley venture capital firm Andreessen Horowitz. Additionally, he co-founded the software company Opsware, which was later sold to Hewlett-Packard, and launched Ning, a platform for social networking. Andreessen has been inducted into the World Wide Web Hall of Fame and, as of January 2025, his net worth is estimated at $1.9 billion.

Early life and education

Born in Cedar Falls, Iowa, Andreessen was raised in New Lisbon, Wisconsin. His parents are Patricia and Lowell Andreessen, the latter employed by a seed company. In December 1993, he completed a bachelor's degree in computer science at the University of Illinois at Urbana-Champaign (UIUC). During his undergraduate years, he interned twice at IBM's Austin, Texas branch, focusing on AIX graphics software development that involved working with the MIT X Window System and 3D graphics APIs like SGI's Graphics Language (GL) and PHIGS.

While at UIUC's National Center for Supercomputing Applications (NCSA), Andreessen became acquainted with Tim Berners-Lee’s open standards for the World Wide Web. After encountering the ViolaWWW graphic browser in late 1992, he collaborated full-time with Eric Bina to develop Mosaic—a cross-platform browser featuring integrated graphics support, including compatibility with Windows. Released in 1993, Mosaic was instrumental in driving widespread adoption of the web.

Career

Andreessen’s professional journey encompasses roles at Netscape, Opsware, founding Andreessen Horowitz, and investing in successful ventures such as Facebook, Foursquare, GitHub, Pinterest, LinkedIn, and Twitter.

Netscape

Upon graduating from the University of Illinois Urbana-Champaign in 1993, Andreessen relocated to California to join Enterprise Integration Technologies. Soon after, he partnered with Jim Clark, founder of Silicon Graphics, to launch an Internet software company. They established Mosaic Communications Corporation in Mountain View, California, with Andreessen serving as co-founder and vice president of technology. Due to trademark conflicts, the firm was renamed Netscape Communications and introduced its flagship product, Netscape Navigator.

The company's 1995 IPO brought Andreessen considerable recognition, including a feature on the cover of Time magazine.

In 1999, AOL purchased Netscape for $4.3 billion and appointed Andreessen as its chief technical officer. That same year, he was honored by MIT Technology Review as one of the top 100 innovators under age 35.

Opsware

Following AOL’s acquisition of Netscape in 1998, Andreessen co-founded Opsware alongside Ben Horowitz, Tim Howes, and In Sik Rhee. Initially called Loudcloud, the company offered computing infrastructure, hosting services, and software solutions tailored for internet and e-commerce businesses. After divesting its hosting operations to EDS in 2003, Loudcloud rebranded as Opsware with Andreessen assuming the role of chairman. Hewlett-Packard acquired Opsware for $1.6 billion in 2007. Opsware was among the early adopters providing software as a service (SaaS) and cloud hosting technologies.

Andreessen Horowitz

From 2005 through 2009, Andreessen and Horowitz invested a total of $80 million in 45 startups, including notable companies such as Twitter and Qik, establishing themselves as prominent super angel investors. On July 6, 2009, they officially founded their venture capital firm based in Silicon Valley, named Andreessen Horowitz.

Investments

Launching with an initial capital of $300 million, Andreessen Horowitz expanded its assets under management to $2.7 billion across three separate funds within just three years. By 2012, their investment portfolio featured major companies like Facebook, Foursquare, GitHub, Pinterest, Twitter, and Honor, Inc.

On September 1, 2009, a consortium of investors that included Andreessen Horowitz secured a controlling interest in Skype at a valuation of $2.75 billion—a bold investment that yielded significant returns when Microsoft acquired Skype for $8.5 billion in 2011. The firm also played a role in 2010 by helping to create standardized documentation for seed round financing to simplify early-stage startup funding.

Andreessen held a position on eBay’s board from 2008 until October 2014, when he stepped down due to disagreements over the PayPal spin-off. His opposition to this separation sparked public conflicts with investor Carl Icahn, who accused Andreessen of having conflicts of interest related to eBay’s 2009 Skype sale.

Andreessen has invested in various special economic zones including California Forever in Northern California, Próspera off the coast of Honduras, and the proposed city of Praxis. Additionally, he supports Pronomos Capital, which finances several special economic zone initiatives worldwide. These projects are connected to the growing Network State movement.

Industry influence

Andreessen acts as an advisor to executives at companies funded by Andreessen Horowitz, such as Mark Zuckerberg of Facebook and Mark Pincus of Zynga.

In 2011, Andreessen and Horowitz were ranked sixth on Vanity Fair’s New Establishment List and topped CNET's list of most influential investors. In the following year’s Forbes Midas List, they were placed second and twenty-first among Tech's leading investors.

In April 2012, Andreessen along with General Partners Ben Horowitz, Peter Levine, Jeff Jordan, John O'Farrell, and Scott Weiss committed to donating half of their lifetime earnings from venture capital to charitable causes.

Andreessen was included in the 2012 edition of the Time 100, recognizing the world’s most influential figures. His essay titled "Software is eating the world" has been extensively referenced and has had a significant impact on technology investment philosophies.

In 2013, he was honored as one of five Internet and Web pioneers with the first-ever Queen Elizabeth Prize for Engineering.

During the onset of the COVID-19 pandemic, Andreessen authored "It's time to build," proposing technological and cultural strategies to enhance the United States’ response to the crisis.

In October 2023, he published a "Techno-Optimist Manifesto" emphasizing technology as a driving force behind human progress and civilization’s advancement. He also identifies himself as a "tescrealist."

Ventures

Andreessen co-established and led Ning, marking his third entrepreneurial venture after Netscape and Loudcloud. In September 2011, Mode Media acquired Ning for an estimated $150 million, after which Andreessen joined the board of Glam Media.

As an individual investor, Andreessen has backed firms such as LinkedIn and the boutique financial institution Raine. He holds board positions at Meta, Kno, Stanford Hospital, Bump Technologies, Anki, Oculus VR, OpenGov, Dialpad, and TinyCo. Previously, he was a Hewlett Packard Enterprise board member but chose not to pursue reelection in 2018; during his service, he encountered criticism related to significant executive appointments and acquisitions like Autonomy and Palm.

Andreessen also serves as an advisor to Asana and sits on the board of CollabNet. A prominent advocate for Bitcoin, he participates on an advisory panel for Neom, Saudi Arabia’s ambitious futuristic city initiative.

Department of Government Efficiency

Although not formally affiliated with Elon Musk's DOGE, Andreessen is acknowledged by The Washington Post as a pivotal figure in talent acquisition for the agency. He has additionally shared perspectives on DOGE’s strategic direction in multiple interviews.

Criticism

In February 2016, Andreessen attracted criticism following a tweet denouncing India’s net neutrality policies concerning Facebook’s Free Basics program. The tweet was deleted after widespread backlash, including disapproval from Facebook founder Mark Zuckerberg. The Free Basics project eventually failed in India due to regulatory breaches involving preferential access to certain content and the creation of a closed internet ecosystem.

In April 2016, a class action lawsuit was filed by Facebook shareholders opposing Zuckerberg’s plan to introduce non-voting shares. The complaint alleged that Andreessen, acting as an independent director, covertly advised Zuckerberg to obtain board approval. Court evidence revealed private exchanges where Andreessen updated Zuckerberg on developments and assisted in negotiations against shareholder interests.

Personal life

Andreessen wed Laura Arrillaga in 2006. She is the founder of the Silicon Valley Social Venture Fund and daughter of Silicon Valley real estate magnate John Arrillaga. The couple has one son.

In 2009, Andreessen offered a $25,000 reward for information leading to the conviction in the unresolved 1987 murder of Barbara Blackstone, a teacher from his Wisconsin high school. As of 2022, the case remains open.

In 2021, Andreessen and his wife acquired a Malibu estate for $177 million—the highest recorded price for a residential property in California at that time. His net worth was estimated at $1.7 billion by Forbes as of February 2023.

In 2022, Andreessen opposed the development of 131 multifamily housing units in affluent Atherton, California, advocating for limits on housing density. This position drew criticism due to perceived inconsistency with his earlier support for expanding housing availability across California.

Politics

Andreessen has supported various political figures over time, having endorsed and voted for Bill Clinton, Al Gore, John Kerry, Barack Obama, and Hillary Clinton. In 2012, he contributed $100,000 to Republican Mitt Romney’s campaign. During the 2016 primaries, he backed Republican Carly Fiorina but shifted support to Democrat Hillary Clinton following her withdrawal because of opposition to Donald Trump’s immigration policies.

In July 2024, Andreessen publicly announced contributions to super PACs supporting Donald Trump’s 2024 presidential bid. Early in 2025, he donated $3 million to MAGA Inc., a pro-Trump super PAC. He is also a significant donor to Fairshake, an advocacy organization promoting cryptocurrency adoption.

Andreessen opposed Joe Biden’s 2024 re-election campaign over concerns about increased taxes on billionaires and tighter regulations impacting his investments in cryptocurrency and artificial intelligence. On Joe Rogan’s podcast in November 2024, he discussed challenges faced by some cryptocurrency users related to unfair banking restrictions.

Honors

In 1994, Andreessen was one of six individuals honored with induction into the World Wide Web Hall of Fame during the First International Conference on the World-Wide Web.

Publications

External links