William Doniger
Managing Partner/Board Member at Grand Park Capital
Greenwich, Connecticut
William Doniger, Managing Partner/Board Member at Grand Park Capital is an active investor based in Greenwich, Connecticut. This profile covers what William Doniger backs, at which stage, and how founders can reach out in 2026.
William Doniger is CEO and a former Fortress Investment Group Partner with over 25 years leading and investing in complex, investor-backed businesses.
William Doniger invests in SaaS & Enterprise and Consumer & Retail, typically at Early Stage Venture and Late Stage Venture.
- Investor type
- VCPE
- Stages
- Early Stage VentureLate Stage Venture
- Invests in
- SaaS & EnterpriseConsumer & Retail
- Location
- Greenwich, Connecticut
- Typical check
- $3.8M
How to reach William Doniger
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About this profile
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Cite this page
Round Funded. "William Doniger." Round Funded investor database, updated November 3, 2026.
Stable URL, it will not change: https://www.roundfunded.com/en/investor/william-doniger
Frequently Asked Questions
Who is William Doniger?
William Doniger, Managing Partner/Board Member at Grand Park Capital is an active investor based in Greenwich, Connecticut. William Doniger invests in SaaS & Enterprise and Consumer & Retail, typically at Early Stage Venture and Late Stage Venture.
What does William Doniger invest in?
William Doniger invests in SaaS & Enterprise and Consumer & Retail, typically at Early Stage Venture and Late Stage Venture. Match your sector and stage, then reach out with a personalized pitch.
What stage does William Doniger invest at?
William Doniger typically invests at Early Stage Venture and Late Stage Venture. Lead with traction that fits the stage when you reach out.
What is William Doniger's typical check size?
William Doniger typically writes checks around $3.8M. 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.