Marc Andreessen Personality Type: ENTJ
Co-founder and General Partner, Andreessen Horowitz; previously Netscape · The Commanding Visionary
Marc Andreessen, co-founder of Netscape and Andreessen Horowitz, profiles as an ENTJ with visionary thinking of 95/100, among the highest in this index. He is the only person profiled here who built the thing, then built the firm that funds the things: he co-authored Mosaic in 1993, the first browser to display inline images, then co-founded Netscape, then Loudcloud, and finally a16z in 2009 with $300 million.
Who is Marc Andreessen?
Marc Andreessen is the American software engineer and investor who co-authored the Mosaic web browser in 1993, co-founded Netscape, and co-founded the venture capital firm Andreessen Horowitz with Ben Horowitz in 2009.
He appeared on the David Senra podcast on March 15, 2026.
What makes Marc Andreessen’s profile unusual?
Andreessen has among the highest visionary thinking in this index and comparatively modest execution focus (78), which matches a career of three distinct acts rather than one sustained build. He wrote software that changed how the web was used, then repeatedly moved to the next position rather than operating any single company for decades. He is also the only profile here who appears twice on this site: as a living founder in this index and as an archetype users can match to.
Marc Andreessen’s Big Five scores
| Openness | 92 | |
|---|---|---|
| Conscientiousness | 82 | |
| Extraversion | 72 | |
| Agreeableness | 30 | |
| Emotional Stability | 80 |
MBTI type ENTJ is derived from these Big Five scores, not assigned separately. See the methodology.
Marc Andreessen’s entrepreneurial traits
| Risk Tolerance | 90 | +8 vs median | |
|---|---|---|---|
| Visionary Thinking | 95 | +7 vs median | |
| Execution Focus | 78 | -10 vs median | |
| People Orientation | 60 | -5 vs median | |
| Technical Depth | 90 | +19 vs median | |
| Sales Ability | 85 | 0 vs median | |
| Resilience | 88 | 0 vs median | |
| Creativity | 90 | +6 vs median | |
| Analytical Rigor | 92 | +4 vs median | |
| Work Intensity | 92 | +3 vs median |
What is the evidence for these scores?
Every score above is an inference from the public record. The specific evidence behind each one is listed here so it can be checked.
Visionary Thinking
Visionary thinking near the top of this index, evidenced by measurable effect on the web itself.
Co-authored the Mosaic browser with Eric Bina, released in 1993 and the first web browser to display inline images. Web traffic rose by 342,000% within a year and the number of websites grew from 50 to 10,000.
Wikipedia, "Marc Andreessen" · 2026-08-17Risk Tolerance
Repeated company building across three decades, each exiting at scale.
Co-founded Netscape, which went public in 1995 and was acquired by AOL in 1999 for $4.3 billion, then co-founded Loudcloud with Ben Horowitz, Tim Howes and In Sik Rhee, renamed Opsware in 2003 and bought by Hewlett-Packard for $1.6 billion in 2007.
Wikipedia, "Marc Andreessen" · 2026-08-17Sales Ability
Converted operating credibility into a capital vehicle that scaled quickly.
Announced Andreessen Horowitz on 6 July 2009 with Ben Horowitz and $300 million in initial capital; within three years the firm managed $2.7 billion across three funds.
Wikipedia, "Marc Andreessen" · 2026-08-17Technical Depth
Technical depth recognised by engineering institutions, not only by industry.
Inducted into the World Wide Web Hall of Fame in 1994 and named one of five recipients of the Queen Elizabeth Prize for Engineering in 2013.
Wikipedia, "Marc Andreessen" · 2026-08-17
Strengths
- +Writing the software that made the web usable by non-technical people
- +Recognising when a position is played out and moving to the next one rather than defending it
- +Turning public argument into deal flow through widely-read essays
- +Building an investment firm with operator credibility rather than finance credibility
Structural risks
- −Lower execution focus than the operators here: none of his companies were run for decades
- −Very low agreeableness makes his public positions a recurring source of controversy
- −A firm built on his personal brand inherits the volatility of that brand
- −Pattern recognition from the 1990s web may not transfer cleanly to every later category
Questions about Marc Andreessen’s personality
What is Marc Andreessen’s personality type?
On the Founder Mode framework, Marc Andreessen profiles as ENTJ, derived from a Big Five estimate of openness 92, conscientiousness 82, extraversion 72, agreeableness 30, emotional stability 80. His visionary thinking of 95 is among the highest in this index.
What did Marc Andreessen invent?
He co-authored the Mosaic web browser with Eric Bina, released in 1993 and the first browser to display inline images. Within a year of its release, web traffic rose by 342,000% and the number of websites grew from 50 to 10,000. He later co-founded Netscape.
When was Andreessen Horowitz founded?
It was announced on 6 July 2009, co-founded with Ben Horowitz and capitalised initially at $300 million. Within three years the firm managed $2.7 billion across three funds, with portfolio companies including Facebook, GitHub, Coinbase and Slack.
How do you compare to Marc Andreessen?
The assessment scores you on the same 10 traits and the same Big Five scale used on this page, so your results are directly comparable.
Take the free assessmentMarc Andreessen is also one of the founder archetypes you can match to.
