Marc Lowell Andreessen ( ; born July 9, 1971) is an American businessman and former
software engineer
Software engineering is a branch of both computer science and engineering focused on designing, developing, testing, and maintaining software applications. It involves applying engineering principles and computer programming expertise to develop ...
. He is the co-author of
Mosaic
A mosaic () is a pattern or image made of small regular or irregular pieces of colored stone, glass or ceramic, held in place by plaster/Mortar (masonry), mortar, and covering a surface. Mosaics are often used as floor and wall decoration, and ...
, the first widely used
web browser
A web browser, often shortened to browser, is an application for accessing websites. When a user requests a web page from a particular website, the browser retrieves its files from a web server and then displays the page on the user's scr ...
with a graphical user interface; co-founder of
Netscape
Netscape Communications Corporation (originally Mosaic Communications Corporation) was an American independent computer services company with headquarters in Mountain View, California, and then Dulles, Virginia. Its Netscape web browser was o ...
; and co-founder and general partner of
Silicon Valley
Silicon Valley is a region in Northern California that is a global center for high technology and innovation. Located in the southern part of the San Francisco Bay Area, it corresponds roughly to the geographical area of the Santa Clara Valley ...
venture capital firm
Andreessen Horowitz. He co-founded and later sold the software company
Opsware to
Hewlett-Packard
The Hewlett-Packard Company, commonly shortened to Hewlett-Packard ( ) or HP, was an American multinational information technology company. It was founded by Bill Hewlett and David Packard in 1939 in a one-car garage in Palo Alto, California ...
; he also co-founded
Ning, a company that provides a platform for social networking websites. He is an inductee in the
World Wide Web Hall of Fame. Andreessen's net worth is estimated at $1.9 billion as of January 2025.
Early life and education
Andreessen was born in
Cedar Falls, Iowa, and raised in
New Lisbon, Wisconsin.
[Simone Payment, ''Marc Andreessen and Jim Clark: The Founders of Netscape'', The Rosen Publishing Group, 2006, p. 15. .] He is the son of Patricia and Lowell Andreessen, who worked for a seed company. In December 1993,
he received his
bachelor's degree
A bachelor's degree (from Medieval Latin ''baccalaureus'') or baccalaureate (from Modern Latin ''baccalaureatus'') is an undergraduate degree awarded by colleges and universities upon completion of a course of study lasting three to six years ...
in
computer science
Computer science is the study of computation, information, and automation. Computer science spans Theoretical computer science, theoretical disciplines (such as algorithms, theory of computation, and information theory) to Applied science, ...
from the
University of Illinois at Urbana–Champaign
The University of Illinois Urbana-Champaign (UIUC, U of I, Illinois, or University of Illinois) is a public land-grant research university in the Champaign–Urbana metropolitan area, Illinois, United States. Established in 1867, it is the f ...
(UIUC). As an undergraduate, he interned twice at
IBM
International Business Machines Corporation (using the trademark IBM), nicknamed Big Blue, is an American Multinational corporation, multinational technology company headquartered in Armonk, New York, and present in over 175 countries. It is ...
in
Austin, Texas
Austin ( ) is the List of capitals in the United States, capital city of the U.S. state of Texas. It is the county seat and most populous city of Travis County, Texas, Travis County, with portions extending into Hays County, Texas, Hays and W ...
. He worked in the AIX graphics software development group responsible for the MIT
X implementation and ports of the 3D language APIs: SGI's Graphics Language (GL) and PHIGS. He also worked at the
National Center for Supercomputing Applications
The National Center for Supercomputing Applications (NCSA) is a unit of the University of Illinois Urbana-Champaign, and provides high-performance computing resources to researchers in the United States. NCSA is currently led by Professor Bill ...
(NCSA) at the University of Illinois, where he became familiar with
Tim Berners-Lee
Sir Timothy John Berners-Lee (born 8 June 1955), also known as TimBL, is an English computer scientist best known as the inventor of the World Wide Web, the HTML markup language, the URL system, and HTTP. He is a professorial research fellow a ...
's open standards for the
World Wide Web
The World Wide Web (WWW or simply the Web) is an information system that enables Content (media), content sharing over the Internet through user-friendly ways meant to appeal to users beyond Information technology, IT specialists and hobbyis ...
. After being shown the
ViolaWWW graphic web browser in late 1992, Andreessen and full-time salaried co-worker
Eric Bina worked on creating a browser with integrated graphics that could be ported to a wide range of computers, including Windows. The result was the Mosaic web browser released in 1993.
Career
Andreessen has worked at
Netscape
Netscape Communications Corporation (originally Mosaic Communications Corporation) was an American independent computer services company with headquarters in Mountain View, California, and then Dulles, Virginia. Its Netscape web browser was o ...
,
Opsware, founded
Andreessen Horowitz, and invested in many successful companies including
Facebook
Facebook is a social media and social networking service owned by the American technology conglomerate Meta Platforms, Meta. Created in 2004 by Mark Zuckerberg with four other Harvard College students and roommates, Eduardo Saverin, Andre ...
,
Foursquare,
GitHub
GitHub () is a Proprietary software, proprietary developer platform that allows developers to create, store, manage, and share their code. It uses Git to provide distributed version control and GitHub itself provides access control, bug trackin ...
,
Pinterest
Pinterest is an American social media service for publishing and discovery of information in the form of digital Bulletin board, pinboards. This includes recipes, home, style, motivation, and inspiration on the Internet using image sharing. Pint ...
,
LinkedIn
LinkedIn () is an American business and employment-oriented Social networking service, social network. It was launched on May 5, 2003 by Reid Hoffman and Eric Ly. Since December 2016, LinkedIn has been a wholly owned subsidiary of Microsoft. ...
, and
Twitter
Twitter, officially known as X since 2023, is an American microblogging and social networking service. It is one of the world's largest social media platforms and one of the most-visited websites. Users can share short text messages, image ...
.
Netscape
After graduating from UIUC in 1993, Andreessen moved to
California
California () is a U.S. state, state in the Western United States that lies on the West Coast of the United States, Pacific Coast. It borders Oregon to the north, Nevada and Arizona to the east, and shares Mexico–United States border, an ...
to work at Enterprise Integration Technologies. Andreessen then met with
Jim Clark, the founder of
Silicon Graphics
Silicon Graphics, Inc. (stylized as SiliconGraphics before 1999, later rebranded SGI, historically known as Silicon Graphics Computer Systems or SGCS) was an American high-performance computing manufacturer, producing computer hardware and soft ...
, who had recently exited the firm. Clark believed the Mosaic browser had great commercial possibilities and suggested starting an Internet software company. Soon,
Mosaic Communications Corporation was in business in
Mountain View, California
Mountain View is a city in Santa Clara County, California, United States, part of the San Francisco Bay Area. Named for its views of the Santa Cruz Mountains, the population was 82,376 at the 2020 United States census, 2020 census.
Mountain V ...
, with Andreessen as co-founder and vice president of technology. The University of Illinois was unhappy with the company's use of the Mosaic name, so Mosaic Communications changed its name to Netscape Communications, and its flagship Web browser was the
Netscape Navigator
The 1990s releases of the Netscape (web browser), Netscape line referred to as Netscape Navigator were a series of now discontinued web browsers. from versions 1 to 4.08. It was the Core product, flagship product of the Netscape, Netscape Comm ...
.
Netscape's
IPO in 1995 put Andreessen in the public eye. He was on the cover of ''
Time
Time is the continuous progression of existence that occurs in an apparently irreversible process, irreversible succession from the past, through the present, and into the future. It is a component quantity of various measurements used to sequ ...
'' and other publications.
Netscape was acquired in 1999 for $4.3 billion by
AOL. Andreessen's hiring as its
chief technical officer was contingent on the completion of the acquisition. The same year, he was named to the ''
MIT Technology Review
''MIT Technology Review'' is a bimonthly magazine wholly owned by the Massachusetts Institute of Technology. It was founded in 1899 as ''The Technology Review'', and was re-launched without "''The''" in its name on April 23, 1998, under then pu ...
''
TR100 as one of the top 100 innovators in the world under the age of 35.
Opsware
After AOL acquired Netscape in late 1998, Andreessen founded Opsware with
Ben Horowitz,
Tim Howes, and In Sik Rhee.
Originally named Loudcloud, the company provided computing, hosting and software services to consumer-facing internet and e-commerce companies. Loudcloud sold its hosting business to
EDS and changed its name to
Opsware in 2003, with Andreessen serving as chairman. Acquired by Hewlett-Packard for $1.6 billion in 2007, it was one of the first companies to offer
software as a service
Software as a service (SaaS ) is a cloud computing service model where the provider offers use of application software to a client and manages all needed physical and software resources. SaaS is usually accessed via a web application. Unlike o ...
and to attempt cloud hosting.
Andreessen Horowitz
Between 2005 and 2009, Andreessen and Horowitz separately invested a total of $80 million in 45 startups, including
Twitter
Twitter, officially known as X since 2023, is an American microblogging and social networking service. It is one of the world's largest social media platforms and one of the most-visited websites. Users can share short text messages, image ...
and
Qik.
The two became well known as
super angel investors.
On July 6, 2009, Andreessen and Horowitz announced their Silicon Valley venture-capital firm Andreessen Horowitz.
Investments
Andreessen Horowitz began with an initial capitalization of $300 million;
within three years the firm grew to $2.7 billion under management across three funds.
In 2012, Andreessen Horowitz's portfolio holdings included
Facebook
Facebook is a social media and social networking service owned by the American technology conglomerate Meta Platforms, Meta. Created in 2004 by Mark Zuckerberg with four other Harvard College students and roommates, Eduardo Saverin, Andre ...
,
Foursquare,
GitHub
GitHub () is a Proprietary software, proprietary developer platform that allows developers to create, store, manage, and share their code. It uses Git to provide distributed version control and GitHub itself provides access control, bug trackin ...
,
Pinterest
Pinterest is an American social media service for publishing and discovery of information in the form of digital Bulletin board, pinboards. This includes recipes, home, style, motivation, and inspiration on the Internet using image sharing. Pint ...
,
Twitter
Twitter, officially known as X since 2023, is an American microblogging and social networking service. It is one of the world's largest social media platforms and one of the most-visited websites. Users can share short text messages, image ...
, and Honor, Inc.
On September 1, 2009, an investor group that included Andreessen Horowitz acquired a majority stake in
Skype
Skype () was a proprietary telecommunications application operated by Skype Technologies, a division of Microsoft, best known for IP-based videotelephony, videoconferencing and voice calls. It also had instant messaging, file transfer, ...
at a valuation of $2.75 billion,
which was considered risky.
The deal paid off in May 2011 when
Microsoft
Microsoft Corporation is an American multinational corporation and technology company, technology conglomerate headquartered in Redmond, Washington. Founded in 1975, the company became influential in the History of personal computers#The ear ...
bought Skype for $8.5 billion.
In 2010, the firm assisted Silicon Valley attorney
Ted Wang in creating the first free standardized seed round financing documents, the Series Seed Documents.
Andreessen joined the
eBay
eBay Inc. ( , often stylized as ebay) is an American multinational e-commerce company based in San Jose, California, that allows users to buy or view items via retail sales through online marketplaces and websites in 190 markets worldwide. ...
board of directors in 2008 and served on it for six years. In October 2014, he announced his resignation from the board due to the company's decision to break off its
online payments unit
PayPal
PayPal Holdings, Inc. is an American multinational financial technology company operating an online payments system in the majority of countries that support E-commerce payment system, online money transfers; it serves as an electronic alter ...
. The decision to cut ties with PayPal was a point of contention between Andreessen and investor
Carl Icahn
Carl Celian Icahn (; born February 16, 1936) is an American businessman and investor. He is the founder and controlling shareholder of Icahn Enterprises, a public company and diversified conglomerate holding company based in Sunny Isles Beach, ...
. Icahn advocated for the PayPal split while Andreessen opposed the spin-off, resulting in public disputes. Andreessen was accused by Icahn of putting his own interests in front of what was best for shareholders. Icahn published his argument in an open letter that detailed alleged conflicts of interest in eBay's 2009 sale of Skype to a group of private investors, which included Andreessen's firm.
Andreessen has invested in multiple special economic zones including
California Forever in northern California,
Próspera off the coast of Honduras, and
Praxis in an as yet to be announced location. He has also invested in Pronomos Capital, which is funding multiple special economic zone projects across the world. These special economic zones have been linked by various sources to the Network State movement.
Industry influence
Andreessen advises the leaders of companies in which Andreessen Horowitz invests, including
Mark Zuckerberg
Mark Elliot Zuckerberg (; born May 14, 1984) is an American businessman who co-founded the social media service Facebook and its parent company Meta Platforms, of which he is the chairman, chief executive officer, and controlling sharehold ...
of Facebook and
Mark Pincus of Zynga.
Andreessen and Horowitz were ranked No. 6 on ''
Vanity Fair''s 2011 New Establishment List,
no. 1 on
CNET's 2011 most influential investors list
and Nos. 2 and 21, respectively, on the 2012 ''
Forbes
''Forbes'' () is an American business magazine founded by B. C. Forbes in 1917. It has been owned by the Hong Kong–based investment group Integrated Whale Media Investments since 2014. Its chairman and editor-in-chief is Steve Forbes. The co ...
''
Midas List of Tech's Top Investors.
In April 2012, Andreessen and Andreessen Horowitz General Partners Ben Horowitz,
Peter Levine,
Jeff Jordan,
John O'Farrell, and
Scott Weiss pledged to donate half their lifetime incomes from venture capital to charitable organizations.
In 2012, Andreessen was named in the
''Time'' 100, an annual list of the 100 most influential people in the world assembled by ''
Time
Time is the continuous progression of existence that occurs in an apparently irreversible process, irreversible succession from the past, through the present, and into the future. It is a component quantity of various measurements used to sequ ...
''.
His essay "Software is eating the world" has been influential and widely cited.
In 2013, Andreessen was one of five Internet and Web pioneers awarded the inaugural
Queen Elizabeth Prize for Engineering.
In April 2020, early in the
COVID-19 pandemic
The COVID-19 pandemic (also known as the coronavirus pandemic and COVID pandemic), caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), began with an disease outbreak, outbreak of COVID-19 in Wuhan, China, in December ...
, Andreessen published an opinion article, "It's time to build", describing the
United States' COVID-19 response and suggesting technological and cultural solutions to the problem.
In October 2023, Andreessen published a "
Techno-Optimist Manifesto" arguing that civilization is built on technology and that "Technology is the glory of human ambition and achievement, the spearhead of progress, and the realization of our potential." He has also described himself as a "
tescrealist".
Ventures
Andreessen cofounded and chaired Ning, the third company he established, after Netscape and Loudcloud.
In September 2011, it was announced that Ning had been sold to
Mode Media for a reported price of $150 million. Andreessen joined Glam Media's board of directors after the sale.
He is a personal investor in companies including
LinkedIn
LinkedIn () is an American business and employment-oriented Social networking service, social network. It was launched on May 5, 2003 by Reid Hoffman and Eric Ly. Since December 2016, LinkedIn has been a wholly owned subsidiary of Microsoft. ...
[ ] and boutique bank Raine.
Andreessen serves on the board of
Meta,
Hewlett Packard Enterprise
The Hewlett Packard Enterprise Company (HPE) is an American multinational information technology company based in Spring, Texas. It is a business-focused organization which works in servers, storage, networking, containerization software and ...
,
Kno
Kno, Inc. was a software company that worked with publishers to offer digital textbooks and other educational materials. In November 2013, after raising nearly $100 million in venture capital, the company was acquired by Intel. The website was ...
,
Stanford Hospital,
Bump Technologies,
Anki,
Oculus VR
Reality Labs, formerly Oculus VR, is a business and research unit of Meta Platforms (formerly Facebook Inc.) that produces virtual reality (VR) and augmented reality (AR) hardware and software, including virtual reality headsets such as the Qu ...
,
OpenGov, Dialpad, and
TinyCo. Hewlett Packard Enterprise announced in February 2018 that board member Andreessen would not seek reelection at the 2018 Annual Meeting of Stockholders on April 4. In his time at Hewlett Packard, Andreessen had been partially blamed for some of the company's failures, including the recruiting of
Léo Apotheker as well as the acquisitions of
Autonomy
In developmental psychology and moral, political, and bioethical philosophy, autonomy is the capacity to make an informed, uncoerced decision. Autonomous organizations or institutions are independent or self-governing. Autonomy can also be ...
and
Palm.
He is advisor to
Asana
An āsana (Sanskrit: आसन) is a body posture, originally and still a general term for a sitting meditation pose,Verse 46, chapter II, "Patanjali Yoga sutras" by Swami Prabhavananda, published by the Sri Ramakrishna Math p. 111 and late ...
and director of
CollabNet.
He is a proponent of
Bitcoin
Bitcoin (abbreviation: BTC; Currency symbol, sign: ₿) is the first Decentralized application, decentralized cryptocurrency. Based on a free-market ideology, bitcoin was invented in 2008 when an unknown entity published a white paper under ...
. Andreessen is on an advisory board for
Neom, the
Saudi Arabia
Saudi Arabia, officially the Kingdom of Saudi Arabia (KSA), is a country in West Asia. Located in the centre of the Middle East, it covers the bulk of the Arabian Peninsula and has a land area of about , making it the List of Asian countries ...
n government's plan to build a futuristic
megacity
A megacity is a very large city, typically with a population of more than 10 million people. The United Nations Department of Economic and Social Affairs (UN DESA) in its 2018 "World Urbanization Prospects" report defines megacities as urban a ...
in the desert.
Department of Government Efficiency
While not officially part of
Elon Musk
Elon Reeve Musk ( ; born June 28, 1971) is a businessman. He is known for his leadership of Tesla, SpaceX, X (formerly Twitter), and the Department of Government Efficiency (DOGE). Musk has been considered the wealthiest person in th ...
's
DOGE, Andreesseen has been listed as a “a key networker for talent recruitment” at the agency, according to ''The Washington Post''. He has also shared insight about DOGE's plans in various interviews.
Criticism
In February 2016, Andreessen posted a tweet in response to India's decision to apply
net neutrality
Net neutrality, sometimes referred to as network neutrality, is the principle that Internet service providers (ISPs) must treat all Internet communications equally, offering User (computing), users and online content providers consistent tra ...
to Facebook's proposed project
Free Basics. The tweet suggested that anti-colonialism had been catastrophic for the Indian people. Andreessen later deleted the tweet following criticism from Indians and non-Indians alike (including Facebook founder
Mark Zuckerberg
Mark Elliot Zuckerberg (; born May 14, 1984) is an American businessman who co-founded the social media service Facebook and its parent company Meta Platforms, of which he is the chairman, chief executive officer, and controlling sharehold ...
).
Facebook spent millions advertising Free Basics to the Indian public. The project failed due to violations, setting preferential tariffs in accessing content and setting up a
"walled garden" on the internet.
In April 2016, Facebook shareholders filed a class action lawsuit to block Zuckerberg's plan to create a new class of non-voting shares. The lawsuit alleges Andreessen secretly coached Zuckerberg through a process to win board approval for the stock change, while Andreessen served as an independent board member representing stockholders.
According to court documents, Andreessen shared information with Zuckerberg about their progress and concerns and helped Zuckerberg negotiate against shareholders. Court documents included transcripts of private texts between Zuckerberg and Andreessen.
Personal life
Andreessen married
Laura Arrillaga in 2006. She is the founder of the Silicon Valley Social Venture Fund and daughter of Silicon Valley real estate billionaire
John Arrillaga
John Arrillaga (April 3, 1937 – January 24, 2022) was an American billionaire real estate developer and Philanthropy, philanthropist who was one of the largest landowners in Silicon Valley. He was also a college basketball player when he atten ...
. They have one son together.
In 2009, Andreessen issued a $25,000 reward for information leading to a conviction in the 1987 unsolved murder of Barbara Blackstone, a teacher from
New Lisbon High School in Wisconsin, which he had attended. The case remains unsolved as of 2022.
In 2021, he and his wife bought a property in Malibu for $177 million from Serge and Florence Azria. This was the highest price paid for a California property at that time. As of February 2023, his net worth is estimated at $1.7 billion by ''
Forbes
''Forbes'' () is an American business magazine founded by B. C. Forbes in 1917. It has been owned by the Hong Kong–based investment group Integrated Whale Media Investments since 2014. Its chairman and editor-in-chief is Steve Forbes. The co ...
''.
In 2022, Andreessen advocated against the construction of 131 multifamily housing units in their affluent
Atherton, California town.
In a letter, Andreessen and his wife wrote that they opposed permitting more than one house on a single acre of land.
Andreessen's comments sparked criticisms of hypocrisy, as he had previously argued for increased housing supply, in particular in California.
Politics
Andreessen endorsed and voted for
Bill Clinton
William Jefferson Clinton (né Blythe III; born August 19, 1946) is an American politician and lawyer who was the 42nd president of the United States from 1993 to 2001. A member of the Democratic Party (United States), Democratic Party, ...
,
Al Gore
Albert Arnold Gore Jr. (born March 31, 1948) is an American former politician, businessman, and environmentalist who served as the 45th vice president of the United States from 1993 to 2001 under President Bill Clinton. He previously served as ...
,
John Kerry
John Forbes Kerry (born December 11, 1943) is an American attorney, politician, and diplomat who served as the 68th United States secretary of state from 2013 to 2017 in the Presidency of Barack Obama#Administration, administration of Barac ...
,
Barack Obama
Barack Hussein Obama II (born August 4, 1961) is an American politician who was the 44th president of the United States from 2009 to 2017. A member of the Democratic Party, he was the first African American president in American history. O ...
and
Hillary Clinton
Hillary Diane Rodham Clinton ( Rodham; born October 26, 1947) is an American politician, lawyer and diplomat. She was the 67th United States secretary of state in the administration of Barack Obama from 2009 to 2013, a U.S. senator represent ...
. In 2012, Andreessen donated $100,000 to Republican presidential candidate
Mitt Romney
Willard Mitt Romney (born March 12, 1947) is an American businessman and retired politician. He served as a United States Senate, United States senator from Utah from 2019 to 2025 and as the 70th governor of Massachusetts from 2003 to 2007 ...
. During the 2016 primary season, he endorsed Republican candidate
Carly Fiorina
Cara Carleton "Carly" Fiorina (; ; born September 6, 1954) is an American businesswoman and politician, known primarily for her tenure as chief executive officer (CEO) of Hewlett-Packard (HP) from 1999 to 2005. Fiorina was the first woman to le ...
, but after Fiorina dropped out of the race, Andreessen switched his endorsement to the Democratic nominee Hillary Clinton, citing the Republican nominee
Donald Trump
Donald John Trump (born June 14, 1946) is an American politician, media personality, and businessman who is the 47th president of the United States. A member of the Republican Party (United States), Republican Party, he served as the 45 ...
's immigration stance.
In July 2024, Andreessen announced he would donate to Super PACs that support
Donald Trump's 2024 presidential campaign.
Andreessen is a mega-donor to the political superPAC and pro-cryptocurrency advocacy group
Fairshake.
Andreessen came out against president
Joe Biden
Joseph Robinette Biden Jr. (born November 20, 1942) is an American politician who was the 46th president of the United States from 2021 to 2025. A member of the Democratic Party (United States), Democratic Party, he served as the 47th vice p ...
's
re-election bid, saying he feared higher taxes on billionaires and stricter regulations on industries he invests in (cryptocurrency and AI).
On
Joe Rogan's podcast in November 2024, Andreessen claimed that some cryptocurrency users have been unfairly
debanked.
Accolades
Andreessen was one of six inductees in the
World Wide Web Hall of Fame announced at the
First International Conference on the World-Wide Web in 1994.
Writings
* "
Techno-Optimist Manifesto"
"Why Software is Eating the World""Why AI Will Save the World"
References
External links
*
*
{{DEFAULTSORT:Andreessen, Marc
1971 births
American computer programmers
American financial company founders
American technology company founders
American venture capitalists
Andreessen Horowitz
AOL employees
Arrillaga family
California Republicans
Directors of Facebook
Grainger College of Engineering alumni
Internet pioneers
Living people
Netscape people
People from Cedar Falls, Iowa
People from New Lisbon, Wisconsin
Silicon Valley people
American billionaires
Midas List
Effective accelerationism
Netscape
Department of Government Efficiency people