Marianne Winslett
General Partner, R3i Future Fund; Chief Science Officer, R3i Impact Foundation at R3i Ventures
United States
Marianne Winslett, General Partner, R3i Future Fund; Chief Science Officer, R3i Impact Foundation at R3i Ventures is an active investor based in United States. This profile covers what Marianne Winslett backs, at which stage, and how founders can reach out in 2026.
Marianne Winslett is a venture capitalist and computer science researcher in data, parallel computing, and cybersecurity, also a licensed contractor.
Marianne Winslett invests in Cybersecurity, Developer Tools & Data and Impact & Social Enterprise, typically at Seed, Series A and Early Stage Venture.
- Investor type
- VC
- Stages
- SeedSeries AEarly Stage Venture
- Invests in
- CybersecurityDeveloper Tools & DataImpact & Social Enterprise
- Location
- United States
- Typical check
- $500K
How to reach Marianne Winslett
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Round Funded. "Marianne Winslett." Round Funded investor database, updated November 3, 2026.
Stable URL, it will not change: https://www.roundfunded.com/en/investor/marianne-winslett
Frequently Asked Questions
Who is Marianne Winslett?
Marianne Winslett, General Partner, R3i Future Fund; Chief Science Officer, R3i Impact Foundation at R3i Ventures is an active investor based in United States. Marianne Winslett invests in Cybersecurity, Developer Tools & Data and Impact & Social Enterprise, typically at Seed, Series A and Early Stage Venture.
What does Marianne Winslett invest in?
Marianne Winslett invests in Cybersecurity, Developer Tools & Data and Impact & Social Enterprise, typically at Seed, Series A and Early Stage Venture. Match your sector and stage, then reach out with a personalized pitch.
What stage does Marianne Winslett invest at?
Marianne Winslett typically invests at Seed, Series A and Early Stage Venture. Lead with traction that fits the stage when you reach out.
What is Marianne Winslett's typical check size?
Marianne Winslett typically writes checks around $500K. 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.