Who is Marc Andreessen, Silicon Valley’s Billionaire Kingmaker?

Silicon Valley sign

Who is Marc Andreessen, Silicon Valley’s Billionaire Kingmaker?

An screen capture of Mosaic in its early days.

Who is Marc Andreessen?

Marc Andreessen is an American entrepreneur, investor, software engineer, and billionaire. He started his career at an early age with a project finished before finishing his Bachelor’s in computer science. Today, he is well-known for his venture capital firm, Andreessen Horowitz, and his publications on the a16z website. He can be found at his house in Atherton, California where he has made his home next to his lifelong business partner, Ben Horowitz.

Early Life

Marc Lowell Andreessen’s birth was on July 9, 1971, in Cedar Falls, Iowa. He was raised in New Lisbon, Wisconsin by his parents Patricia and Lowell Andreessen, who worked at a seed company.

Quick Facts

Full Name
Marc Lowell Andreessen
July 9, 1971
Net Worth
$1.699 billion (Forbes)
  • World Wide Web Hall of Fame
Place of Birth
Cedar Falls, Iowa
Fields of Expertise
[“Business”,”software engineering”]
University of Illinois, IBM, National Center for Supercomputing Applications, Mosaic, Netscape, Andreessen Horowitz, Opsware, Ning, Meta Platforms, Facebook, Foursquare, GitHub, LinkedIn, Twitter, eBay
Mosaic, Netscape, Opsware, Andreessen Horowitz

He completed his Bachelor’s degree in computer science at the University of Illinois at Urbana-Champaign in December 1993. As an undergraduate, he served two internships at IBM in Austin, Texas where he worked in the AIX graphics software development group that was later responsible for the MIT X Window implementation and porting of 3D language APIs.

He also worked at the NCSA at the University of Illinois, which is often attributed as the place he became intimately familiar with Tim-Berner-Lee’s open standards for the World Wide Web. While at NCSA, he recruited a full-time co-worker, Eric Bina, to help him create a user-friendly browser with integrated graphics that could work on a wide range of computers and not just Unix machines. His creation of the web browser Mosaic at such an early age is what skyrocketed him from the co-founder of Netscape Communications Corporation to one of the most influential venture capital firms in technology and solidified his position as an American billionaire.


Mosaic and Netscape

Marc Andreessen changed the name of Mosaic to Netscape due to NCSA claiming theft.

Around a year after graduating with a Bachelor’s degree in computer science, Andreessen was contacted by James Clark, the founder of Silicon Graphics, Inc. Clark was looking for a new and exciting venture. Andreessen had spent time during college at an internship at IBM, Texas, and later at the National Center for Supercomputing Applications (NCSA) while attending the University of Illinois. This hands-on experience gave him an intimate knowledge of the Internet and the Web as a whole.

At the time of his internship, most of the browsers were available for Unix machines. The high price of Unix machines made accessing the Internet difficult for anyone outside of academia and engineers. The earliest browsers were notoriously unfriendly to users. During his final year at the University of Illinois, Andreessen recruited Eric Bana, a fellow NCSA employee, to embark on a journey to create a user-friendly graphic web browser that eventually became Mosaic.

Mosaic opened the internet to anyone with an at-home machine which changed the development of the Internet indefinitely. The explosion of Internet users also became an explosion of web developers. With the backing of James Clark, Andreessen and Bina formed the Mosaic Communications Corporation in 1994 in Mountain View, California.

The wild success of Mosaic was not without its bumps in the road. The NCSA at the University of Illinois claimed that Andreessen and Bina had stolen Mosaic from the university and demanded the product’s name be changed. They were also told to quit distributing their product.

Andreessen decided that he would not quit offering the software, but he did agree to change the name to Netscape Communications Corporation. The University of Illinois was not completely satisfied until an agreement was reached on December 21, 1994. The University of Illinois received a financial settlement that cost Netscape around $3 million.

By 1996, three-quarters of web users browsed with Netscape. The wide success of Netscape put Andreessen in public view and even earned him a feature on the cover of ‘Time’ magazine as well as other popular publications. After a while, Andreessen was ready for the next adventure. The popularity of Netscape had garnered plenty of attention from investors, especially AOL.

In 1999, Netscape was purchased by AOL for $4.3 billion. Andreessen made it a requirement that he was hired as the Chief Technology Officer at AOL as part of the acquisition.


Andreessen’s position with AOL didn’t stop him from continuing to partner with innovative technology companies. He partnered up with Ben Horowitz, Tim Howes, and In Sik Rhee to found Loudcloud. Loudcloud was among the first companies to offer cloud-computing services to the consumer end of the internet and e-commerce companies.

Loudcloud was a successful project that was used by many well-known entities to create an online presence such as The US Army. As the technology evolved, it became clear that network hosting and online services were becoming too much to hold under one roof. Loudcloud sold its hosting business to EDS and began to focus solely on online services as a business-to-business company. The name was changed to Opsware in 2003 to reflect the new direction with Andreessen sitting as the chairman.

After building yet another company up to a high value, Horowitz and Andreessen sold Opsware to Hewlett-Packard for $1.6 billion in 2007.

Andreessen Horowitz

Andreessen Horowitz is a capital investment firm created in 2009 by Marc Andreessen and Ben Horowitz.

Ben Horowitz and Marc Andreessen had already become angel investors starting in 2005. The two had separately invested around $80 million in over 40 startup businesses including Twitter and Qik. With a new reputation being formed as Silicon Valley Kingmakers, the two decided to partner up and make it official with the creation of a venture-capital firm Andreessen Horowitz.

The firm began with an initial fund of $300 million. Within three years, the firm grew to $2.7 billion across three funds. The firm’s portfolio holdings include Facebook, GitHub, Foursquare, Pinterest, Twitter, and Honor. The successful investments solidified Andreessen’s reputation as Kingmaker.

Capital Investor and Industry Advisor

Due to Andreessen’s investment nature, he sits and has sat on the board of directors of nearly every giant influential tech company even before the creation of Andreessen Horowitz. For example, he joined the board of eBay in 2008, where he served for six years. He only split from this board after a disagreement with Carl Icahn over the decision to break off PayPal from the rest of the company. Andreessen was accused of putting his own interests ahead of the shareholders by Icahn who expressed his grievances in an open letter that detailed the conflicts of interest of the sale of Skype in 2009 to private investors.

Continuing with his involvement in companies Andreessen has invested in, Andreessen often advises leaders of companies his firm has holdings with such as Mark Zuckerberg of Facebook and Mark Pingus of Zynga.

Here are some of the companies Andreessen serves on the board of directors with:

  • Facebook
  • Hewlett-Packard Enterprise
  • Kno
  • Stanford Hospital
  • Bump Technologies
  • Meta Platforms
  • Anki
  • Oculus VR
  • OpenGov
  • Dialpad
  • TinyCo
  • LinkedIn
  • CollabNet
  • Asana
Silicon Valley on a map

Silicon Valley has been the epicenter for tech innovation in America.

What is Marc Andreessen Known For?


Andreessen and Eric Bina are responsible for the creation of Mosaic and Mosaic Communications Corporation which later was renamed Netscape and Netscape Communications Corporation. This was one of the first web browsers to bring a user-friendly interface and graphic improvements. Mosaic was launched in 1993. The University of Illinois claimed that Andreessen and Bina stole Mosaic from the college. To resolve the dispute, Andreessen renamed the web browser Netscape and made a financial settlement with the University of Illinois.

Netscape went on to become the most popular web browser used by the internet community. It continued its success until Netscape was sold to AOL for $4.3 billion.

Silicon Valley Kingmaker

Andreessen and his longtime partner, Ben Horowitz, are known as the Silicon Valley Kingmakers and some of the most influential angel investors in the tech industry. Throughout their careers, these two men innovated the technology of the time and made the investments necessary to push the world forward into accepting the world wide web.

While the investment firm Andreessen Horowitz wasn’t formed until 2009, Andreessen had already been a successful and prolific angel investor since 2005. The investment holdings allow Andreessen to be a large influence on the technology industry by giving him the influence of each company’s board of directors and even direct relationships with their CEOs.

Here are some companies Andreessen Horowitz has invested in:

  • Meta Platforms, formerly Facebook
  • LinkedIn
  • Hewlett-Packard Enterprises
  • Kno
  • Stanford Hospital
  • Bump Technologies
  • Anki
  • OpenGov
  • Dialpad
  • TinyCo
  • Oculus VR
  • Asana
  • CollabNet
  • Foursquare
  • GitHub
  • Pinterest
  • Twitter

Marc Andreessen: Marriage, Divorce, Children, and Personal Life

Net Worth

According to Forbes’s real-time indicator for net worth, Marc Andreessen is currently evaluated at $1.6 billion.


Andreessen married Laura Arrillaga in 2006. She is the daughter of the real estate mogul John Arrillaga. Arrillaga is often credited with the creation of the modern Silicon Valley office layout. According to his profile in the New Yorker, Andreessen met his wife at a New Year’s Eve party hosted by a prominent investor in eHarmony. Laura is an author and philanthropist. The addition of Andreessen to the Arrillaga family was a perfect fit for the influential Arrillaga house.


The Andreessen couple became a family with their one and only child, John Andreessen.

Marc Andreessen: Awards and Achievements

MIT Technology Review TR35 and TR100

Andreessen is recognized by the editors of Technology Review as a technologist under 35 who actively changed the world at 28 years old. He was also listed in the TR100 which is the Technology Reviews list of 100 brilliant young innovators whose ideas will change the world.

World Wide Web Hall of Fame

Marc Andreessen has been inducted into the internet hall of fame for his software engineering contributions with Mosaic and his influence over the technology industry as an investor and advisor.

CNET’s 2011 Most Influential Investor

In 2011, CNET named Marc Andreessen as the No. 1 ranked influential investor alongside his life-long partner Ben Horowitz.

Queen Elizabeth Prize for Engineering

In March 2013, Andreessen was one of five Internet pioneers given the first Queen Elizabeth Prize for Engineering in recognition of outstanding advances in engineering that have changed the world.

Included in “Time 100”

In 2012, Andreessen was added to Time Magazine’s list of the 100 most influential people in the world.

Marc Andreessen Published Works and Books

  • “Technology Saves the World”
  • “Carta”
  • “Bio Eats World: The Cost Disease in Healthcare”
  • “Bio Eats World: It’s Time to Build in Healthcare”
  • “Applied Intuition Series C”
  • “Marc Andreessen On Productivity, Scheduling, Reading Habits, Work, and More”
  • “It’s Time to Build”
  • “Investing in Roblox”
  • “Anduril”
  • “Applied Intuition Series B”
  • “The Pmarca Guide to Startups”

Marc Andreessen Quotes

  • “There are people who are wired to be skeptics and there are people who are wired to be optimists. And I can tell you, at least from the last 20 years, if you bet on the side of the optimists, generally you’re right.”
  • “My goal is not to fail fast. My goal is to succeed over the long run. They are not the same thing.”
  • “All’s fair in love, war, and ride-sharing.”
  • “Innovation accelerates and compounds. Each point in front of you is bigger than anything that ever happened.”
  • “Over the next 10 years, I expect many more industries to be disrupted by software, with new world-beating Silicon Valley companies doing the disruption in more cases than not.”
  • “A lot of things you want to do as part of daily life can now be done over the Internet.”
  • “Most of the big breakthrough technologies/companies seem crazy at first: PCs, the internet, Bitcoin, Airbnb, Uber, 140 characters. It has to be a radical product. It has to be something where, when people look at it, at first they say, ‘I don’t get it, I don’t understand it. I think it’s too weird, I think it’s too unusual.”
  • “The smartphone revolution is under-hyped, more people have access to phones than access to running water. We’ve never had anything like this before since the beginning of the planet.”
  • “At Microsoft, they all rock back and forth like Gates, they wear the same glasses, they have the same hairstyle. Maybe they grow them in tanks.”

Up Next…

We have other great articles surrounding Silicon Valley and its leadership. Check these out!

  • The 5 Real Reasons Netscape Failed. Let’s dig a little deeper in the reasons behind the failure.
  • Andreessen Horowitz: The History of Silicon Valley’s Kingmakers. The two innovators founded this company together to create a new vision for Silicon Valley.
  • 7 Reasons Miami is Becoming the Next Silicon Valley. Miami is the fastest growing tech job market in America.

Frequently Asked Questions

How did Marc Andreessen become a billionaire?

Andreessen became a billionaire after the sale of Netscape to AOL which was made for $4.3 billion and a secured position as the Chief Technology Officer at AOL in 1999. He grew his wealth forward by reinvesting into the tech industry and Silicon Valley specifically.

Who is Marc Andreessen?

Marc Andreessen is an American entrepreneur, investor, and software engineer who is widely known for his creation of Mosaic, later renamed Netscape, and his heavy influence over Silicon Valley as a capital investor. He was named in Technology Reviews TR100 at the age of 28. His family consists of his wife, Laura Arrillaga-Andreessen, and son, John Andreessen.

What did Marc Andreessen do?

Marc Andreessen co-created a user-friendly browser for a wide range of computers named Mosaic alongside Eric Bina while employed at the University of Illinois’s NCSA. After graduating, the team set about distributing their software and eventually renamed it Netscape. The web browser took 75% of the browser market at its height. In the end, Netscape was sold to AOL for $4.3 billion.

How much is Marc Andreessen worth?

As of May 2022, Marc Andreessen is worth $1.6 billion according to the real-time net worth indicator at Forbes.

What role did Marc Andreessen play in the development of the Web?

Andreessen saw the opportunity for creating a user-friendly web browser interface and created Mosaic to fill the gap. His browser gave owners of PC and Apple computers access to a graphic internet which helped to create future development and use of the Internet as a whole.

Today, he continues his influence on Internet and Web technology through venture capital investments, interviews, and articles published on the a16z website.

Where is Marc Andreessen from?

Andreessen was born in Cedar Falls, Iowa. He was raised in New Lisbon, Wisconsin. However, he has made Atherton, California his home with a house near his lifelong business partner, Ben Horowitz.

Is Marc Andreessen married?

Marc Andreessen was married in 2006 to Laura Arrillaga, the daughter of the Silicon Valley real estate mogul John Arrillaga. The Andreessens have had one child, John Andreessen.

How tall is Marc Andreessen?

Marc Andreessen is 1.9 meters tall, or 6’ 2.8”.

Where did Marc Andreessen go to college?

Andreessen attended the University of Illinois at Urbana-Champaign where he received a bachelor’s in computer science and interned at IBM for the AIX graphics department. He also worked at the NSCA for the university. His time as a part of the NSCA family helped to birth Mosaic and launch him from entrepreneur to venture capital investor.

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