Jonathan Leff
Executive Partner at Sofinnova Investments
Menlo Park, California
Jonathan Leff, Executive Partner at Sofinnova Investments is an active investor based in Menlo Park, California. This profile covers what Jonathan Leff backs, at which stage, and how founders can reach out in 2026.
- Investor type
- VCPEInvestment PartnerHedge FundInvestor
- Stages
- SeedSeries B
- Invests in
- Healthcare & BiotechDigital Health & HealthTechBiotech & PharmaSaaS & EnterpriseConsumer & RetailIoT & Connected Devices
- Location
- Menlo Park, California
- Typical check
- $1.6M
- Past investments
- 71
Notable investments
ENYO PharmaY-mAbs TherapeuticsNuCana
HistogenicsAmplyx Pharmaceuticals
Sorbent Therapeutics
Visen Pharmaceuticals
VersartisAuris Medical
Aerovate Therapeutics
Medeor Therapeutics
GuavusHow to reach Jonathan Leff
Angels and operators like Jonathan Leff 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 Accelerator.
Connect with Jonathan Leff
Frequently Asked Questions
What does Jonathan Leff invest in?
Jonathan Leff invests in Healthcare & Biotech, Digital Health & HealthTech, Biotech & Pharma and SaaS & Enterprise, typically at Seed and Series B. Match your sector and stage, then reach out with a personalized pitch.
What stage does Jonathan Leff invest at?
Jonathan Leff typically invests at Seed and Series B. Lead with traction that fits the stage when you reach out.
What is Jonathan Leff's typical check size?
Jonathan Leff typically writes checks around $1.6M. Use it as a signal for whether your raise fits their stage.
How do I contact Jonathan Leff?
Unlock Jonathan Leff's verified email on Round Funded Accelerator and send a personalized pitch. We surface only deliverable contacts so your outreach lands.