Dorris O'Brien is a Principal at Andreessen Horowitz, whose known portfolio counts 29 companies.
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Investment focus
- Sector
- AIFinTechHealthcareSaaS
Contacts
Affiliated funds' portfolios
Principal at Andreessen Horowitz, whose known portfolio counts 29 companies
- Flora
- Kalshi
- pillar
- Promise
- SuperGaming
- Voyage
- Sage Haven
- Axis
- Nexxa.ai
- Hex Technologies
- Prepared
- Hedra
- and 17 more
Investor Profile
The listing covers sectors AI, FinTech, Healthcare and SaaS, and focus areas Biotech, Crypto, Developer Tools and Enterprise SaaS. Startups operating in these areas may find Dorris O'Brien relevant.
Andreessen Horowitz appears in Growth, Pre-Seed and Seed rounds across its known deals.
The firm portfolio and the focus above give founders context on whether Dorris O'Brien matches their raise.
Colleagues at Andreessen Horowitz
Showing 20 of 147
Andrew Chen
General Partner
San Francisco, United States
Adrian Fenty
Special Advisor
Washington, United States
Joe Schmidt IV
Partner
San Francisco, United States
Daniel C. Liem
Scout
San Francisco, United States
Martin Casado
General Partner
San Francisco, United States
Zane Lackey
General Partner
New York, United States
David Ulevitch
General Partner
New York, United States
Steven Sinofsky
Board Partner
Sioux Falls, United States
Daouda Leonard
Scout
Los Angeles, United States
Erik Torenberg
General Partner
San Francisco, United States
Jonathan Lai
General Partner
Menlo Park, United States
Fareed Mosavat
Visiting Partner, a16z speedrun
Berkeley, United States
Jeff Jordan
General Partner
San Francisco, United States
Ali Yahya
General Partner
New York, United States
Marc Petit
Scout Investor
Montreal, Canada
Angela Strange
General Partner
San Francisco, United States
Margit Wennmachers
Operating Partner
Jackson, United States
Rubén Domínguez Ibar
Scout
United States
Alexey Moiseenkov
Scout
Palo Alto, United States
Guido Appenzeller
Partner
Menlo Park, United States
Frequently asked questions
Who is Dorris O'Brien?
Dorris O'Brien is a venture capital investor based in Redding, California, United States, listed as Principal at Andreessen Horowitz. The known portfolio of that firm counts 29 companies. That portfolio belongs to the firm, not to Dorris O'Brien personally.
What does Dorris O'Brien invest in?
Listed sectors include AI, FinTech, Healthcare and SaaS; listed focus areas include Biotech, Crypto, Developer Tools and Enterprise SaaS. Those tags come from the portfolios of the firms this profile is attached to, so they read as a record of what has been backed rather than a stated preference for what comes next.
What stage does Dorris O'Brien invest at?
Andreessen Horowitz appears in Growth, Pre-Seed and Seed rounds across its known deals, and Dorris O'Brien is listed there as Principal. Stage is the strongest single filter when you build a target list: an investor with no record at your stage rarely starts with you.
Which firm is Dorris O'Brien listed at?
Dorris O'Brien is listed as Principal at Andreessen Horowitz. 147 other people in the database share a firm with Dorris O'Brien.
How do I contact Dorris O'Brien?
A LinkedIn page is on file for Dorris O'Brien. It is readable inside RaiseHunt after you create an account. The database holds no email address and no phone number for this profile.
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Data: RaiseHunt investor dataset · Snapshot 6 September 2026 · How this data is built · Report a correction or request removal