Mark Heising
Founder & Managing Director @ Medley Partners
Mark Heising is a Managing Director of Medley Partners in San Francisco, CA. He founded the firm in 2004.Previously he was the President of VLSI Cores, which designs and licenses cryptographic integrated circuits.He holds six U.S. Patents in cryptography, compression and data communications.Mark serves as a director for Lam Aviation,Sion Power, Solexant and Tabula. On the non-profit side, Mark currently serves on the Board of Directors of the Bipartisan Policy Center and the Environmental Defense Fund.Mark earned a BS in Physics and a MS in Electrical Engineering and Computer Sciences from the University of California at Berkeley.
- Total investments:
- 8
- Last investment:
- Lead investor:
- 13%
Last updated:
For AI agents: llms.txt
Industries Mark Heising invests in
Stages Mark Heising invests in
Countries Mark Heising invests in
Contacts
| Type | Contact | Validation |
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Investment Focus
Industry
- Electronics 2 (25%)
- Energy 1 (13%)
- Chemical 1 (13%)
- Consumer 1 (13%)
- CleanTech 1 (13%)
Stage
- Series A 2 (25%)
- Series B 1 (13%)
- Series C 1 (13%)
- Series D 1 (13%)
- Series E 1 (13%)
Investments
| Company | Description | Round | Links |
|---|---|---|---|
Molten Industries
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Molten Industries develops clean technology with the goal of decarbonizing the hydrogen market. The company's technology generates the most affordable and environmentally friendly hydrogen. | $25M / Series A / Jun 20, 2024 | |
Siva Power
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Siva Power develops third-generation thin-film PV technologies which increase solar cell efficiency and reduce manufacturing costs, therefore enabling the commercialization of solar modules that generate electricity at competitive rates without depending on government subsidies. Siva Power was founded in 2006 and headquartered in San Jose,California. | $25M / Series E / May 23, 2017 | |
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Siva Power
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Siva Power develops third-generation thin-film PV technologies which increase solar cell efficiency and reduce manufacturing costs, therefore enabling the commercialization of solar modules that generate electricity at competitive rates without depending on government subsidies. Siva Power was founded in 2006 and headquartered in San Jose,California. | $10M / Series D / Jan 29, 2015 | |
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Siva Power
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Siva Power develops third-generation thin-film PV technologies which increase solar cell efficiency and reduce manufacturing costs, therefore enabling the commercialization of solar modules that generate electricity at competitive rates without depending on government subsidies. Siva Power was founded in 2006 and headquartered in San Jose,California. | $23M / Series C / Jul 01, 2011 | |
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Siva Power
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Siva Power develops third-generation thin-film PV technologies which increase solar cell efficiency and reduce manufacturing costs, therefore enabling the commercialization of solar modules that generate electricity at competitive rates without depending on government subsidies. Siva Power was founded in 2006 and headquartered in San Jose,California. | $41.5M / Series C / Jun 04, 2010 | |
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Siva Power
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Siva Power develops third-generation thin-film PV technologies which increase solar cell efficiency and reduce manufacturing costs, therefore enabling the commercialization of solar modules that generate electricity at competitive rates without depending on government subsidies. Siva Power was founded in 2006 and headquartered in San Jose,California. | $18.2M / Series B / Oct 29, 2008 | |
EnLink Geoenergy Services
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EnLink continues to be an innovative leader in the geothermal heat pump (GHP) industry by virtue of its continuous improvement in the installation of underground loop systems, called Earth Heat Exchangers (EHXs).After 14 years in the business, and with 13 US and international patents to its credit, EnLink has a record of reliability and successin EHX installation that is unsurpassed in the industry. EnLink is committed to total professionalism with its clients, its partners and all the stakeholders who participate in their projects. | $30M / May 19, 2008 | |
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Siva Power
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Siva Power develops third-generation thin-film PV technologies which increase solar cell efficiency and reduce manufacturing costs, therefore enabling the commercialization of solar modules that generate electricity at competitive rates without depending on government subsidies. Siva Power was founded in 2006 and headquartered in San Jose,California. | $4.3M / Series A / Aug 30, 2007 |
Co-Investors
About Medley Partners
Medley Partners manages private equity investments on behalf of Jim Simons' family and a number of affiliated entities.Founded in 2004, Medley invests primarily in private equity funds, including buyout, growth equity, venture capital, real estate and distressed in the United States, Europe and Asia, and also participates in co-investmentopportunities with the funds where it is invested.The firm employs a diverse investment approach by geography and industry, actively seeking new investments with strong managers and compelling long-term value fundamentals.
Medley Partners Contacts
| Name | Phone | Socials | |
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Mark Heising
Founder & Managing Director
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Brent Whisenant
Managing Director
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Brian S. Schneider
Managing Director
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Edson Maduwura
Controller
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FAQ
What does Mark Heising invest in?
Mark Heising invests primarily in Electronics, Energy and Chemical startups, most often at Series A and Series B stage. Most of the 8 investments tracked by Shizune back companies in United States. The Investment Focus section breaks down every industry, stage and country in the portfolio.
How do I contact Mark Heising?
For a verified work email and phone number, create a free Shizune account — contact data is searched across 20+ sources and validated before delivery, so your outreach lands in the right inbox.
When did Mark Heising last invest?
The most recent investment recorded for Mark Heising closed in Jun 2024. Shizune tracks 8 investments in total for this profile, including round sizes, stages and portfolio companies, all sourced from confirmed public funding rounds and refreshed monthly.
Is Shizune's investor data accurate?
Yes — every stat on this profile is calculated from confirmed public funding rounds monitored across hundreds of sources since 2020. This profile was last refreshed in Aug 2026 and is updated monthly. Spotted something off? Use the “Suggest an edit” link near the top of the page.
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