Jun 28, 2024 · 1h 55m · a16z
Marc Andreessen on Inventing The Internet Browser (How We all Access the Internet)
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In this episode of The Ben & Marc Show, venture capitalist Marc Andreessen joins Ben Horowitz to detail the origin story of the web browser, tracing his journey from rural Wisconsin to co-creating NCSA Mosaic and founding Netscape. Together, they explore how open standards, institutional pushback, and visionary software design permanently transformed the internet into a global commercial ecosystem.
How this conversation actually went
Every chapter scored 0–10 on four independent dynamics. Hover any point for the reasoning behind the score. How this is scored →
The host as informed peer 2.7 Guest teaching 3.3 Guest disagreement 1.3 The host pushing back 0.0
speaking balance: gold is the host, purple is the guest (3 minute bins)
Sharpest disagreement ▶ 1:34:30 Marc dismantles credentialed expert authority
Marc forcefully dismisses media and academic experts, citing Phil Tetlock's research showing credentialed experts score worse than a monkey throwing darts at a board while bearing zero consequences for being wrong.
Hardest push from the host ▶ 17:10 Ben reframes internet history to challenge current university AI policyBen takes Marc's defense of federal funding for the internet and reframes it into a critique of modern corporate efforts to restrict open source AI in universities.
Biggest teaching moment ▶ 1:43:15 Marc reveals UIUC's multi-billion dollar equity blunderMarc educates the host on how the University of Illinois rejected $4 million in Netscape equity during legal negotiations, opting for cash and forfeiting over $1 billion in direct stock value.
The host holds their own ▶ 54:03 Ben demonstrates deep technical knowledge on network protocolsBen exhibits impressive domain expertise by identifying ASN.1 binary encoding as the specific standard traditional computer science professors criticized Marc for ignoring in favor of text protocols.
the scores for every segment, with the reasoning behind each
| Chapter | Topic | The host as informed peer | Guest teaching | Guest disagreement | The host pushing back | Why |
|---|---|---|---|---|---|---|
| Show Title Sequence and Legal Disclaimer | 2 | 1 | 1 | 0 | Ben opens the show by introducing Marc Andreessen and setting up the topic of the web browser's invention while dispelling the silver spoon entrepreneur myth. Marc offers disclaimers about 30-year-old memories and admits he was raw aggression and feral back then. | |
| Marc's Upbringing in Rural Wisconsin | 2 | 2 | 0 | 0 | Marc describes growing up in rural Wisconsin, highlighting the agricultural disconnect from Milwaukee and Madison as well as party phone lines. Ben adds light context about school choice and small-town dynamics. | |
| The Early PC Era, Cassette Tapes, and BBS | 3 | 3 | 0 | 0 | Marc walks through his early exposure to personal computing, cassette tape loading, 300-baud acoustic coupler modems, and Bulletin Board Systems. Ben chimes in with technical knowledge regarding early cassette loading speed and baud noise. | |
| University of Illinois, Supercomputers, and Al Gore | 3 | 3 | 1 | 0 | Marc details arriving at UIUC in 1989 amidst federal funding for supercomputing centers and the NSFnet backbone, defending Al Gore's legislative role in funding the internet. Ben supports this framing by contrasting historical funding with modern AI policy challenges in academia. | |
| The Pre-1994 Internet Culture and Expectations | 4 | 3 | 0 | 0 | Marc explains how the pre-1994 internet was strictly non-commercial under the Acceptable Use Policy while tech giants focused on interactive TV. Ben demonstrates strong industry recall regarding Bill Gates promoting the information superhighway over the internet. | |
| Paul Baran and the Cold War Origins of Packet Switching | 2 | 4 | 0 | 0 | Marc recounts Paul Baran's invention of packet switching at the Rand Corporation during the Cold War and how AT&T dismissed it for decades. Ben concurs on AT&T's obsession with central control. | |
| Closed Corporate Networks vs. The Open Internet | 3 | 4 | 1 | 0 | Ben asks how Marc arrived at the browser idea when corporate networks like MSN and AOL threatened to capture the online world. Marc explains how proprietary stovepipes sought to take a cut off every transaction until open systems bypassed them. | |
| Pre-Web Navigational Interfaces: Gopher, WAIS, and CERN Web | 2 | 4 | 0 | 0 | Marc compares pre-web interfaces Gopher, WAIS, and Tim Berners-Lee's early text-based World Wide Web at CERN. Ben prompts on Marc's transition to his junior year job at NCSA. | |
| VR, Scientific Visualization, and Early NCSA Projects | 3 | 3 | 0 | 0 | Marc shares his early work at NCSA on scientific visualization, UIC's virtual reality CAVE, and the real-time collaboration tool Collage. Ben connects the CAVE concept to modern display technology like the Las Vegas Sphere and Hollywood Volume soundstages. | |
| Designing NCSA Mosaic for a Graphical, Broadband Future | 4 | 4 | 1 | 0 | Marc explains the radical choices made in designing Mosaic, such as assuming GUI hardware, high-bandwidth connections, and text-based protocols. Ben displays technical expertise by explicitly naming ASN.1 binary encoding as the standard traditional CS professors insisted upon. | |
| "View Source", The Image Tag, and Unlocking Web Growth | 3 | 3 | 2 | 0 | Marc discusses the impact of 'View Source' and his unilaterally created image tag despite pushback from internet purists wanting to keep content purely academic. Ben highlights how 'View Source' birthed an entire web design industry. | |
| Mosaic's Viral Explosion, Commercial Demand, and Support Chaos | 2 | 4 | 0 | 0 | Marc describes Mosaic's explosive 1993 launch, becoming the unofficial support desk for the entire internet, and having an NSF grant for customer support rejected. Ben asks how commercial interest began surfacing. | |
| Wall Street Journal Reporter Jared Sandberg and Early Media Skepticism | 2 | 3 | 2 | 0 | Marc relates how Wall Street Journal reporter Jared Sandberg could not get editors to publish early stories on Mosaic because media elites dismissed the internet. Ben humorously echoes the media's early dismissal of student coders. | |
| John Markoff's New York Times Front-Page Story on Mosaic | 2 | 3 | 1 | 0 | Marc details John Markoff's front-page New York Times piece that featured NCSA administrators rather than the student developers. Ben asks Marc how he processed being erased from the initial coverage. | |
| The Takeoff of the Web in 1993 and Early Viral Content | 3 | 3 | 0 | 0 | Marc explains the viral flywheel between web content and browser adoption, citing early viral artifacts like the Trojan Room coffee pot webcam and his 'What's New' log. Ben adds mention of the 'What's Cool' page. | |
| Internet Commercialization and the First E-Commerce Website | 2 | 4 | 0 | 0 | Marc describes the NSF handing off the internet backbone to commercial telcos and lifting the AUP, leading to the first fax-gateway e-commerce store for Future Fantasy Books. Ben notes this was the precursor to Amazon. | |
| Marc's Graduation, Mosaic About Page Job Ad, and Move to EIT | 2 | 3 | 1 | 0 | Marc recounts placing a job advertisement on Mosaic's about page, declining Sun Microsystems due to its phantom stock program, and taking a job at Enterprise Integration Technologies. Ben validates Marc's suspicion of phantom stock option schemes. | |
| Meeting Jim Clark and the Birth of Netscape | 3 | 4 | 1 | 0 | Marc describes meeting Jim Clark, cycling through failed startup ideas like interactive TV software and Nintendo dial-up gaming, before realizing the internet was the only viable path. Ben chimes in on the technical impracticability of 14.4k dial-up gaming. | |
| Critique of Expert Judgment and Phil Tetlock's Findings | 4 | 3 | 6 | 0 | Marc launches into a high-combativeness critique of credentialed media and political experts, citing Philip Tetlock's research showing expert predictions perform worse than chance. Ben strongly validates this by recounting mainstream media's early dismissal of Coinbase and Bitcoin. | |
| University of Illinois Legal Conflict and the Spyglass License | 3 | 4 | 4 | 0 | Marc details the University of Illinois licensing Mosaic code to Spyglass and threatening Netscape's customers, forcing Netscape to counter-sue and settle in cash rather than equity. Ben labels UIUC's actions as extremely dirty and shortsighted. | |
| Open Systems vs Closed Systems and Implications for AI | 3 | 4 | 5 | 0 | Marc connects the victory of open internet standards over closed corporate networks to current regulatory capture efforts in AI, calling big tech hypocrisy advanced mental gymnastics. Ben agrees, noting original founders are no longer leading those firms. | |
| Microsoft, Spyglass, and the Demise of Commercial Mosaic | 2 | 4 | 3 | 0 | Marc concludes with the story of Microsoft licensing Spyglass Mosaic for a flat fee and making Internet Explorer free, wiping out Spyglass. Ben wraps up the episode. |
Statements from this episode (41)
Horowitz: The idea that successful founders are born rich is disinformation
“One of the largest disinformation campaigns going is this whole idea that people, entrepreneurs and people who invent things are kind of born with a silver spoon in their mouth.”
Horowitz: Most a16z founders come from middle-class or refugee backgrounds
“Almost none of the successful entrepreneurs we work with is that the case for. They all come from, you know, somewhere between like refugee and middle-class backgrounds.”
Horowitz: Elon Musk arrived in the United States with $2,000
“When he showed up in the US with like 2000 dollars is the actual story, yeah.”
Andreessen never used a BBS growing up due to long-distance costs
“Long-distance phone calls are a dollar a minute. There are no BBSs in my town. And so I read about BBSs. I actually don't, to this day, I think I never actually used one because I couldn't afford it”
Andreessen: Al Gore never claimed to have invented the internet
“He never actually said he invented the internet. What he said is he took the lead in the Senate in creating the internet.”
Horowitz: Big tech is lobbying to eliminate open-source AI in universities
“They're not only underfunded to do AI, but the, there's a push among the big tech companies to Enact legislation that would essentially outlaw AI in universities by eliminating open source.”
Andreessen: a16z is lobbying U.S. senators to federally fund AI infrastructure
“We've been spending a lot of time in Washington lately, and I've actually been telling the story to a lot of current senators and basically in, in encouraging them to basically do the same thing.”
Horowitz: Bill Gates championed the information superhighway over the internet
“Bill Gates was a huge kind of champion of the inner information superhighway and specifically not the internet.”
Andreessen: Commercial activity on the internet was illegal prior to 1993
“The internet up until 1993, the, what was the NSF net, which then turned into the internet the, operated under something that the federal government dictated called the acceptable use policy, the AUP. And because the NSF net was federally funded, The, it was a…”
Andreessen told Reed Hastings in 2004 that Netflix streaming was crazy
“I remember meeting with Reed Hastings in, I think, 2004 and, you know, Netflix was up and running and was very successful doing a DVD rental by mail. And he literally, you know, reads, reads a technical genius in addition to being a business genius. And he sai…”
Andreessen: AT&T used Defense Secretary to fight 1984 antitrust breakup
“In 1984 a federal judge went to break up AT&T which at that time was the national telecom monopoly. They owned and controlled everything. And AT&T actually got the Secretary of Defense in 1984, 20 years later, to testify that that if the federal judge broke up…”
Horowitz: Delayed browser creation would have enabled proprietary network monopolies
“If you had not had the idea when you had it, The internet as we know it probably doesn't happen in that the kind of Microsoft alternative, the Oracle alternative would have had an opportunity to gain a network effect. And so the chance of all this getting buil…”
Andreessen handled user support for the entire internet for 18 months
“I became the user support desk for the entire internet for about a year and a half myself.”
Andreessen: Pre-1993 PCs and Macs lacked built-in TCP/IP support
“Computers, PCs and Macs up until 93, 94 didn't even come with TCP IP built into the computer, built into the operating system.”
Andreessen: Tim Berners-Lee's original World Wide Web lacked inline image support
“But like, just as an example, the web, and when it was originally conceived, didn't have images.”
Andreessen: Synchronous software struggles to build network effects versus asynchronous tools
“To get a real time collaborative system to work, people have to be online at the same time. Yeah. Right. And so you and I are, we're collaborating. We have to be online at the same time and we might be in totally different time zones. And you know, like it's j…”
Andreessen: Compelling software interfaces force the adoption of infrastructure like broadband
“If we designed for broadband, like the, if it's a compelling enough user interface, it will actually cause broadband to happen.”
Andreessen: Text-based protocols beat binary protocols by lowering developer friction
“One of the design principles was all protocols have to be text-based. There were no binary protocols. Text-based protocols are much less efficient, much, much slower. But the enormous advantage is you can program a text-based protocol by writing text and you c…”
Andreessen unilaterally created the HTML image tag as a fait accompli
“We weren't making progress on it, and then I just did a, because I controlled, you know, I controlled Mosaic at that point, so I just did a fait accompli, and I just declared it, and I created the image tag.”
Andreessen: NCSA Mosaic received over 400 enterprise licensing inquiries in 1993
“I remember when it hit like 400 of basically, of basic companies, you know, like general councils and, you know, procurement officers at big companies saying, you know, we want to deploy this throughout our company. You know, who do we pay?”
Andreessen: NSF denied NCSA's grant proposal for Mosaic customer support
“We sent in this grant. It was the only place we had any sense of where to get money, and we sent in this grant, and literally, it came back denied. You know, the National Science Foundation is not in the business of, you know, funding customer support.”
Andreessen did not know venture capital existed while creating Mosaic
“And of course, the answer was because I had no idea that there was such a thing as venture capital.”
Andreessen: Media rejection of the early web caused his distrust of experts
“Like this is, you know, this is why I'm so distrustful of experts. Like this is my origin story for why I don't trust anybody with credentials or anything anymore.”
Andreessen: Issue #1 of Wired magazine did not mention the internet once
“And I read it cover to cover and they did not have the word internet in it once.”
Andreessen: The first NYT article on Mosaic featured uninvolved supervisors
“The bad news is it featured my boss and my boss's boss. Who had nothing to do with the project?”
Andreessen: Most products with network effects fail the cold start problem
“Most things that Need to have that kind of network effect, never get past the cold start problem, right? They just, they strangle early because, you know, there's just not enough writers, which means there's not enough readers. There's not enough readers. Ther…”
Andreessen: The World Wide Web gained one page daily in early 1993
“In early 93, it was like one new website a day. And by the way, by one new website, I don't mean like one new website. I don't mean like a new eBay a day or something. I mean like a new web page.”
Andreessen: Future Fantasy Books created the first formal e-commerce website
“That was the, I think that may have been the first e-commerce, like the, at least the first like formal e-commerce e-commerce thing.”
Andreessen was paid $6.25 per hour while developing Mosaic at NCSA
“I was an undergrad staff member. I was getting paid six dollars and 25 cents an hour capped, I think at 30 hours a week.”
Andreessen posted a personal job ad on NCSA Mosaic's About page
“I added to the about page for the web browser that everybody used at the time. I added saying, by the way, you know, one of the primary authors of this browser is graduating and is available to be hired.”
Sun offered Andreessen a job on the team building Java's precursor
“I got an offer actually from Sun at the time which had a had a unit, they had a software unit of Sun at the time called First Person which was creating what became Java later with James Gosling.”
Andreessen: Tech CEOs in 1994 dismissed the internet as a toy
“And if you just go back and look at the magazine covers from that era, it's basically all these big company CEOs just pouring scorn on the internet and then declaring that it's a joke and a toy. And the thing that they're going to come out with their proprieta…”
Andreessen: Credentialed experts face zero consequences for incorrect predictions
“Like, okay, like maybe they're right, but like if they're wrong and they're wrong, like a lot of the time, like, okay, what consequences do they bear for being wrong? And the answer is none at all. Zero.”
Horowitz: Ideas experts dismiss as scams are almost always worth studying
“If somebody's super dismissive about something, that's a great thing to study, because it's almost surely not a dead zero, right? Like, it may not work, but there's no way it's as bad as they're, you know, saying it. If somebody says something is like A scam, …”
University of Illinois threatened Netscape's prospective sales clients with lawsuits
“And so instead of suing us, what they did instead was they called Spyglass, any situation we were in where we were competing with Spyglass for a sale they, the University of Illinois administrators would call the customer and tell them that they were going to …”
University of Illinois's Netscape stock refusal cost them over $1 billion
“Yeah, that decision on their part yeah, cost them at least a billion dollars in direct stock, plus all the downstream philanthropy from me plus, plus all the downstream philanthropy from Jim Clark, plus all the other founding engineers.”
Andreessen refuses all outreach from University of Illinois administrations
“Every subsequent new administration at the university has attempted to reach out and repair the bridge. I have not returned the calls.”
Andreessen: University philanthropy far outweighs technology licensing fees
“If this kind of thing happens, like if your students or even your faculty, you know, go off and do something new and are successful in business, and then the, you know, the you know, the money that you'll get, the money that you'll get back in philanthropy is …”
Andreessen: AI incumbent lobbyists exist today because the internet was open
“Again, ironically, and some, and to your point, ironically, some of the companies that are lobbying hardest for regulatory capture and cartel, you know, kind of government cartel status for AI are companies that exist today because the internet was open.”
Andreessen: Microsoft licensed Spyglass Mosaic for a $1 million flat fee
“Spyglass gets this call from Microsoft and so the Microsoft guys call Spyglass, and they're like, yeah, we want to license Spyglass Mosaic so we can build it into Windows, and the Spyglass guys say, you know, yeah, that sounds great, you know, basically how mu…”
Andreessen: Original Internet Explorer was relabeled Spyglass Mosaic code
“Microsoft had the press conference where they originally announced Internet Explorer, their browser, which was Spyglass Mosaic, again, our code relabeled and there's a famous, famous moment where the Microsoft guys are on stage and they're, and then they do th…”