Mark Jacobstein
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Mark Jacobstein Email & Phone Number

General Partner at South Park Commons
Location: Stanford, California, United States 25 work roles 1 school
1 work email found @iskoot.com 5 phones found area 510, 415, 650, and 855 LinkedIn matched
✓ Verified May 2026 4 data sources Profile completeness 86%

Contact Signals · 1 work email · 5 phones

Work email m****@iskoot.com
Direct phone (510) ***-****
LinkedIn Profile matched
3 free lookups remaining · No credit card
Current company
South Park Commons
Role
General Partner
Location
Stanford, California, United States
Company size
303 employees

Who is Mark Jacobstein? Overview

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Mark Jacobstein is listed as General Partner at South Park Commons, a company with 303 employees, based in Stanford, California, United States. AeroLeads shows a work email signal at iskoot.com, phone signal with area code 510, 415, 650, 855, and a matched LinkedIn profile for Mark Jacobstein.

Mark Jacobstein previously worked as Visiting Partner at South Park Commons and Co-founder and General Partner at Near Horizon. Mark Jacobstein holds B.A., Computer Science With Cognitive Science from Harvard University.

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Email format at South Park Commons

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{first}@iskoot.com
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AeroLeads found 1 current-domain work email signal for Mark Jacobstein. Compare company email patterns before reaching out.

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Profile bio

About Mark Jacobstein

Mark has built and run companies at the forefront of new technologies for thirty years. In 1994, he founded Small World Sports, the world’s first online fantasy sports business, which he later sold to Paul Allen’s The Sporting News. In 1995, he spun out one of the world’s first web agencies, Small World Software, which he sold to iXL before its 1998 IPO.In 2003, Trip Hawkins convinced Mark to move to the Bay Area to co-found Sequoia and Kleiner Perkins-backed mobile games pioneer Digital Chocolate. Mark was then recruited to join loopt as the “adult supervision” for Sam Altman (Sam didn’t need any supervision). Later, Vinod Khosla recruited Mark to run mobile VOIP pioneer iSkoot, which he sold to Qualcomm in 2010.Mark spent four years as the Chief User Engagement Officer at Guardant Health, which raised more than $500M before its 2019 IPO, and was the CBO for Immunai, a world-leading AI-driven biotech operating at the intersection of machine learning and genomics that raised more than $300M during Mark’s tenure. In 2023, Mark co-founded Jimini Health, which is leveraging LLMs and cutting-edge science to develop radically more effective, engaging, and scalable mental health solutions.In 2023, Mark co-founded Near Horizon to pioneer a new approach to venture building. Near Horizon partners with entrepreneurs at company formation to build AI-powered companies, providing both capital and hands-on help.Mark has advised or invested in numerous startups, including Gerson Lehrman Group, Gusto, Elation EMR, Akash Network, SafeGraph, and Luminopia.Mark earned his BA from Harvard, where he concentrated in Computer Science. He lives on the Stanford campus with his wife and two (adorable) daughters.

Current workplace

Mark Jacobstein's current company

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South Park Commons
South Park Commons
General Partner
Stanford, CA, US
Website
southparkcommons.com
Employees
303
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25 roles · 32 years

Mark Jacobstein work experience

A career timeline built from the work history available for this profile.

Co-Founder And General Partner

Current
Near Horizon

Near Horizon is pioneering a new approach to venture building. We partner with entrepreneurs at company formation to build AI-powered companies, providing both capital and hands-on help

Jul 2023 - Present

Co-Founder And President

Current
Jimini Health

Jimini’s mission is to radically improve the efficacy of mental health care. We are starting by building an AI-augmented therapy model, where we have redesigned the entire patient journey, creating a clinically effective, more modern treatment for patients.Learn more and sign up at jiminihealth.comAs co-founder and President, I work across many aspects of.

Sep 2023 - Present

Venture Builder

Current
Second

San Francisco, California, US

Second automates all of your codebase maintenance, including upgrades (React 18 -> 19, Python 3.10 -> 3.14) and migrations (Angular -> React). We can free your engineering team to spend more time on your product, all for the fraction of the cost of a single engineer. Let's get started today, reach out for more information.

Sep 2024 - Present

Venture Builder

Current
Sanctum, Inc.
Sep 2023 - Present

Venture Builder

Current
Sleuth

Los Angeles, California, US

Aug 2023 - Present

Board Member

Current
Luminopia

Cambridge, Massachusetts, US

Feb 2018 - Present

Board Member

Current
Odin

Cambridge, MA, US

Nov 2020 - Present

Executive Business Advisor And Stay-At-Home Dad

Numerous
Jan 2023 - May 2023

Executive Business Advisor At Immunai

Immunai

New York, NY, US

Part-time business advisor for Immunai and stay-at-home dad.

Apr 2022 - Apr 2023

Chief Business Officer

Immunai

New York, NY, US

Oct 2020 - May 2022

Chief User Engagement Officer

Guardant Health

Palo Alto, California, US

Guardant Health (https://www.guardanthealth.com/) is the world’s leader in “blood biopsies”: blood tests that track tumor genomics and identify treatment options. As CUEO I was responsible for ensuring that Guardant's products are engaging for all of our customers – not only our physicians, but also our patients, their families, advocates, and anyone whose.

Jul 2015 - Jul 2019

Chief Sabbatical Officer

No Longer On Sabbatical

Largely working with technology startups:Angel Investor in companies including Gerson Lehrman Group (Silverlake), VoiceStar (Marchex), Lab Pixies (Google), Shopular, Disconnect, ZenPayroll, ElationEMR, Nuzzle, AngelList, Alta Motors, Artivest, Finomial, DietBet, Scoot Networks, Cambrian Genomics, reTargetter, Aperia Technologies, PURETi, Expedite.

Jan 2013 - Jun 2015

Vp Product Management

Qualcomm

Qualcomm acquired iSkoot in October 2010. During my lockup I ran the iSkoot group inside Qualcomm. Also:Created an IP-communications platform leveraging both iSkoot’s technology and Qualcomm’s existing QChat product line. Designed to underpin new mobile services requiring easy-to-implement, high-quality, low latency mobile VoIP and messaging services..

Oct 2010 - Jan 2013

Ceo

Iskoot

San Francisco, CA, US

Brought in by board members from Khosla Ventures and Charles River Ventures to raise $20M series C financing and drive company forward. Led successful sale of the company to Qualcomm. Highlights of tenure included:Expanded mobile Skype initiatives with both 3/Hutch and direct-to-consumerRaised $20M series C during difficult fundraising environmentLeveraged.

Dec 2007 - Oct 2010

Entrepreneur In Residence

Charles River Ventures

Palo Alto, CA, US

Developed wireless health startup plan; was recruited to run iSkoot, a CRV company

Aug 2007 - Nov 2007

Evp Corporate Development & Marketing

Loopt, Inc.

I was responsible for a variety of functions for loopt, a Palo Alto-based start up developing the world's first "social mapping" software for mobile phones.

Jan 2006 - Jul 2007

President Of Publishing, Co-Founder

Digital Chocolate

My primary responsibility was running the global publishing business for Digital Chocolate. I oversaw the entire product development process, from concept to launch, for our two international studios, and helped close our first two rounds of financing from Sequoia, KPCB, and Sutter Hill.

Dec 2003 - Dec 2005

Entrepeneur In Residence

Advantage Capital
2003 - 2003

Vp Wireless And Itv

Sporting News

Integrated Small World Sports, world's first online fantasy sports business, into Paul Allen's Sporting News business following our acqusition. Oversaw iTV strategy for TSN as well.

2001 - 2002 ~1 yr

Ceo

Small World Sports

Founded and ran the world's first online fantasy sports business. Started business in 1994 in my living room, predating the birth of the commercial internet, and built 100+ person company that raised $20M+ in VC from firms including Flatiron, NBCi, and Chase Capital Partners before selling company to Paul Allen's Sporting News.

1994 - 2002 ~8 yrs

Svp

Ixl

New York, NY, US

Ran Business Development for iXL's NYC office from the time of iXL's acquisition of Small World Software (which I co-founded and ran) through iXL's successful IPO.

1998 - 2000 ~2 yrs

Founder And Partner (De Facto Co-Ceo)

Small World Software

Founded one of the first web agencies / Internet solution companies in the world. Small World Software was a successful spin-off from Small World Sports (my fantasy sports business). I sold Small World Software to iXL in 1998 in advance of iXL's IPO.

Apr 1994 - 1998
Team & coworkers

Colleagues at South Park Commons

Other employees you can reach at southparkcommons.com. View company contacts for 303 employees →

AB Abhishek Bhardwaj Abhishek Bhardwaj Colleague at South Park Commons San Francisco, California, United States, United States View → AM Adam Magaluk Adam Magaluk Colleague at South Park Commons New York, New York, United States, United States View → DR Dahlia R. Dahlia R. Colleague at South Park Commons United States, United States View → CL Christian Lusetti Christian Lusetti Colleague at South Park Commons New York, New York, United States, United States View → WY Wilfred Y. Wilfred Y. Colleague at South Park Commons New York City Metropolitan Area, United States View → JP Jacob Peddicord Jacob Peddicord Colleague at South Park Commons San Francisco, California, United States, United States View → TB Tony Benard Tony Benard Colleague at South Park Commons Pendleton, South Carolina, United States, United States View → JE Jeremy Ebobisse Jeremy Ebobisse Colleague at South Park Commons San Francisco, California, United States, United States View → AH Aidan Hughes Stone Aidan Hughes Stone Colleague at South Park Commons San Francisco, California, United States, United States View → JT Jun Tai Jun Tai Colleague at South Park Commons San Francisco Bay Area, United States View →
1 education record

Mark Jacobstein education

  • Harvard University
    Harvard University
    Computer Science With Cognitive Science
FAQ

Frequently asked questions about Mark Jacobstein

Quick answers generated from the profile data available on this page.

What company does Mark Jacobstein work for?

Mark Jacobstein works for South Park Commons.

What is Mark Jacobstein's role at South Park Commons?

Mark Jacobstein is listed as General Partner at South Park Commons.

What is Mark Jacobstein's email address?

AeroLeads has found 1 work email signal at @iskoot.com for Mark Jacobstein at South Park Commons.

What is Mark Jacobstein's phone number?

AeroLeads has found 5 phone signal(s) with area code 510, 415, 650, 855 for Mark Jacobstein at South Park Commons.

Where is Mark Jacobstein based?

Mark Jacobstein is based in Stanford, California, United States while working with South Park Commons.

What companies has Mark Jacobstein worked for?

Mark Jacobstein has worked for South Park Commons, Near Horizon, Jimini Health, Second, and Sanctum, Inc..

Who are Mark Jacobstein's colleagues at South Park Commons?

Mark Jacobstein's colleagues at South Park Commons include Abhishek Bhardwaj, Adam Magaluk, Dahlia R., Christian Lusetti, and Wilfred Y..

How can I contact Mark Jacobstein?

You can use AeroLeads to view verified contact signals for Mark Jacobstein at South Park Commons, including work email, phone, and LinkedIn data when available.

What schools did Mark Jacobstein attend?

Mark Jacobstein holds B.A., Computer Science With Cognitive Science from Harvard University.

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