Fundraising Fox
Mark Jacobstein
InvestorInvestor at South Park Commons
Stanford, California
Writes $500K – $1.2M checks · typically $1M
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You →Scott · together at Small World Software (1994–1998) →Mark
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About
Mark Jacobstein is an entrepreneur and general partner at South Park Commons who has founded and operated companies across digital media, mobile technology, and healthcare over three decades. His earlier ventures include Small World Sports, the first online fantasy sports business sold to The Sporting News, and Digital Chocolate, a mobile games company backed by Sequoia and Kleiner Perkins. Most recently, he co-founded Jimini Health in 2023 to develop mental health solutions using large language models, and Near Horizon, a venture builder focused on AI-powered companies; he previously served as Chief User Engagement Officer at Guardant Health and Chief Business Officer at Immunai.
Experience
- Jimini HealthCo-Founder and Presidentcurrent2023 — presentNew York, United States
- Sanctum, Inc.Venture Buildercurrent2023 — present
- SleuthAdvisorcurrent2023 — present
- LuminopiaBoard Membercurrent2018 — present
- OdinBoard Member2020 — 2026
- SecondVenture Builder2024 — 2025San Francisco Bay Area
- Near HorizonCo-founder and General Partner2023 — 2025Palo Alto, California, United States
- NumerousExecutive Business Advisor and stay-at-home dad2023
- ImmunaiExecutive Business Advisor at Immunai2022 — 2023Stanford, California, United States
- ImmunaiChief Business Officer2020 — 2022San Francisco Bay Area
- Biden Cancer InitiativeCo-Chair Working Group on Data Access2019
- Guardant HealthChief User Engagement Officer2015 — 2019Redwood City, CA
- Full Circle FundBoard Member2011 — 2017San Francisco Bay Area
- No longer on SabbaticalChief Sabbatical Officer2013 — 2015San Francisco Bay Area
- QualcommVP Product Management2010 — 2013San Francisco Bay Area
- iSkootCEO2007 — 2010San Francisco Bay Area
- Charles River VenturesEntrepreneur in Residence2007Palo Alto, CA
- loopt, Inc.EVP Corporate Development & Marketing2006 — 2007
- Digital ChocolatePresident of Publishing, co-Founder2003 — 2005San Mateo
- Advantage CapitalEntrepeneur in Residence2003New York City Metropolitan Area
- Sporting NewsVP Wireless and iTV2001 — 2002New York City Metropolitan Area
- Small World SportsCEO1994 — 2002New York City Metropolitan Area
- iXLSVP1998 — 2000
- Small World SoftwareFounder and Partner (de facto co-CEO)1994 — 1998New York City Metropolitan Area
Skills & more
+12 more
Product ManagementMobile TechnologyEntrepreneurshipMobile InternetProduct MarketingVenture CapitalMobile MarketingLocation Based ServicesMobile CommerceGo-to-market StrategyLeadershipStrategic ThinkingFrom Mark's professional profile.
Investments
Investor
Per curated public sources.
Colleagues at South Park Commons
Frequently asked questions
- Who is Mark Jacobstein?
- Mark Jacobstein is an entrepreneur and general partner at South Park Commons who has founded and operated companies across digital media, mobile technology, and healthcare over three decades. His earlier ventures include Small World Sports, the first online fantasy sports business sold to The Sporting News, and Digital Chocolate, a mobile games company backed by Sequoia and Kleiner Perkins. Most recently, he co-founded Jimini Health in 2023 to develop mental health solutions using large language models, and Near Horizon, a venture builder focused on AI-powered companies; he previously served as Chief User Engagement Officer at Guardant Health and Chief Business Officer at Immunai.
- Where does Mark Jacobstein work?
- Mark Jacobstein is Investor at South Park Commons.
- What check size does Mark Jacobstein write?
- Mark Jacobstein typically writes checks of $500K – $1.2M.
- What companies has Mark Jacobstein invested in?
- Investments tracked here include Happenstance, Shopular.
- Where did Mark Jacobstein go to school?
- Mark Jacobstein studied at Harvard University (B.A., Computer Science with Cognitive Science).
Same school
Also attended Harvard University2,000
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