John Hennessey
Angel Investor at Siva Therapeutics, Inc.
Weston, Massachusetts
John Hennessey, Angel Investor at Siva Therapeutics, Inc. is an active investor based in Weston, Massachusetts. This profile covers what John Hennessey backs, at which stage, and how founders can reach out in 2026.
- Investor type
- AngelInvestor
- Stages
- Pre SeedSeed
- Invests in
- Healthcare & BiotechFintechDigital Health & HealthTech
- Location
- Weston, Massachusetts
- Typical check
- $150K
- Past investments
- 8
Notable investments
How to reach John Hennessey
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Cite this page
Round Funded. "John Hennessey." Round Funded investor database, updated September 9, 2026.
Stable URL, it will not change: https://www.roundfunded.com/en/investor/john-hennessey
Frequently Asked Questions
What does John Hennessey invest in?
John Hennessey invests in Healthcare & Biotech, Fintech and Digital Health & HealthTech, typically at Pre Seed and Seed. Match your sector and stage, then reach out with a personalized pitch.
What stage does John Hennessey invest at?
John Hennessey typically invests at Pre Seed and Seed. Lead with traction that fits the stage when you reach out.
What is John Hennessey's typical check size?
John Hennessey typically writes checks around $150K. Use it as a signal for whether your raise fits their stage.
How do founders reach investors like this?
Round Funded lists active investors with verified, professional contact details for signed-up founders. Filter by sector, stage and location, then send a personalized pitch from your own inbox.
What is Round Funded?
Round Funded is an investor database and outreach platform for startup founders. It lists 60,000+ active investors with verified contacts, filtered to recent investment activity, and lets founders send personalized pitches from their own Gmail, track replies, and share a free Data Room. Round+ starts at $99 per month with a 3-day trial.