Mark Jacobsen
Managing Director at O'Reilly AlphaTech Ventures
San Francisco, California
Mark Jacobsen, Managing Director at O'Reilly AlphaTech Ventures is an active investor based in San Francisco, California. This profile covers what Mark Jacobsen backs, at which stage, and how founders can reach out in 2026.
- Investor type
- VCMicro VCPE
- Stages
- Early Stage VenturePre SeedSeed
- Invests in
- Artificial IntelligenceHealthcare & BiotechBiotech & PharmaSaaS & EnterpriseConsumer & RetailConsumer Goods (CPG)E-commerce & D2CDeveloper Tools & Data
- Location
- San Francisco, California
- Typical check
- $250K
- Past investments
- 57
Notable investments
FoursquareLearnZillionCampagoSherpaaFidelis
Bloom StudioMaker Media
3D RoboticsScrollCotton Bureau
RiffynHow to reach Mark Jacobsen
Angels and operators like Mark Jacobsen reply to specific, personalized notes that show real traction, not mass blasts. Build a verified list, write a note that fits their thesis, and track replies, all on Round Funded Accelerator.
Connect with Mark Jacobsen
Frequently Asked Questions
What does Mark Jacobsen invest in?
Mark Jacobsen invests in Artificial Intelligence, Healthcare & Biotech, Biotech & Pharma and SaaS & Enterprise, typically at Early Stage Venture, Pre Seed and Seed. Match your sector and stage, then reach out with a personalized pitch.
What stage does Mark Jacobsen invest at?
Mark Jacobsen typically invests at Early Stage Venture, Pre Seed and Seed. Lead with traction that fits the stage when you reach out.
What is Mark Jacobsen's typical check size?
Mark Jacobsen typically writes checks around $250K. Use it as a signal for whether your raise fits their stage.
How do I contact Mark Jacobsen?
Unlock Mark Jacobsen's verified email on Round Funded Accelerator and send a personalized pitch. We surface only deliverable contacts so your outreach lands.