Donald Fischer

Active Investor

VP at Sonar

Boston, Massachusetts

Donald Fischer, VP at Sonar is an active investor based in Boston, Massachusetts. This profile covers what Donald Fischer backs, at which stage, and how founders can reach out in 2026.

Investor type: AngelInvestment PartnerInvestor
Stages: Pre SeedSeed
Invests in: Healthcare & BiotechSaaS & EnterpriseConsumer & RetailDeveloper Tools & DataCybersecurityHardware & Deep TechLegalTech
Location: Boston, Massachusetts
Typical check: $150K
Past investments: 9

Notable investments

RocanaAnacondaAnaconda, Inc.JuliaHubIonicTypesafe (now Lightbend)WayScriptkrypt.coGeneral Catalyst

How to reach Donald Fischer

Angels and operators like Donald Fischer reply to specific, personalized notes that show real traction, not mass blasts. Build a verified list, write a note that fits their thesis, and track replies, all on Round Funded.

Frequently Asked Questions

What does Donald Fischer invest in?

Donald Fischer invests in Healthcare & Biotech, SaaS & Enterprise, Consumer & Retail and Developer Tools & Data, typically at Pre Seed and Seed. Match your sector and stage, then reach out with a personalized pitch.