S. Alexander Jacobson is a serial founder-turned-investor at 137 Ventures who led SpaceX diligence at Founders Fund before space became mainstream and has a rare background combining cognitive science research with multiple exits including Shop.com. He specializes in customized liquidity solutions for growth-stage companies and sits on Strategy Capital's board of advisors, while investing across biotech, frontier infrastructure, and hard tech rather than traditional software deals.
What they've been talking about across their social media accounts

- Prioritizes cybersecurity and the vulnerability of digital infrastructure. Expresses a belief that security is fundamentally reshaping the tech landscape, pointing out how simultaneous outages across major technology, retail, and finance companies could be coordinated attacks rather than mere coincidences.
- Analyzes social dynamics and human behavior within digital networks. Thinks deeply about how people interact online to signal social standing, even considering building a custom tool to map out social hierarchies based on simple platform interactions like thanking someone for a friend connection.
- Values user experience and practical software design over purely technical constraints. Believes systems should prioritize human workflow and content over hardware resource management, explicitly arguing that computer interfaces should organize around active content windows rather than the underlying applications consuming memory.
- Explores broader technological philosophy and the mechanics of how ideas spread. Highlights how highly attractive or simplistic explanations usually win out over factual accuracy in public discourse, and regularly evaluates concepts around decentralized web control and why traditional software applications will outlast automated conversational interfaces.
About their Fund
Sectors
SaaS, Consumer, Fintech, Defense, Space
Rounds
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Notable Investments
137 Ventures pioneered building an entire venture capital firm around providing customized liquidity solutions to founders and early employees at late-stage private companies like SpaceX, Stripe, and Palantir, rather than treating secondary transactions as a side activity. The firm structures highly bespoke financing solutions tailored to each individual's situation and positions itself as a long-term partner that can hold positions through IPO and beyond while providing partial liquidity earlier in the journey.
Notable Fund
Investments
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Sheets they're in
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Sheets they're Fund is in
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Popular Investors
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Active in
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Links
Deeptech / Hardware
Robotics
Biotech
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12
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Unknown
Pre-Seed - Seed
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$400K - $2M
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Defense
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7
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Unknown
Pre-Seed - Series A
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Defense
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7
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Biotech
Health
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2
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Unknown
Pre-Seed - Seed
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$250K - $2M
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Climate
Deeptech / Hardware
Materials
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4
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Unknown
Pre-Seed - Seed
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$400K - $1.5M
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Deeptech / Hardware
Robotics
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7
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$400K - $2M
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Deeptech / Hardware
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Biotech
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2
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Unknown
Pre-Seed - Seed
Unknown
~$750K
Unknown
Fintech
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2
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Unknown
Pre-Seed - Series A
Unknown
$250K-$1M
Unknown
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