Mark Josephson
Entrepreneur in Residence (EIR) at Yale Ventures
Bethesda, Maryland
Mark Josephson, Entrepreneur in Residence (EIR) at Yale Ventures is an active investor based in Bethesda, Maryland. This profile covers what Mark Josephson backs, at which stage, and how founders can reach out in 2026.
Mr. Mark Josephson is a Co-Founder and serves as Chief Executive Officer and Board Member at Castiron. Mr. Josephson is an Angel Investor. He served as Advisor at DIMO. He also served as Chief Executive Officer at bitly. He served as Chief Technology Officer at Mediaplex. He served as Chief Executive Officer at Outside.In.
- Investor type
- AngelAccelerator
- Stages
- Early Stage VenturePre SeedSeedLate Stage Venture
- Invests in
- Mobility & LogisticsEdTechSaaS & EnterpriseMarketing & AdTech
- Location
- Bethesda, Maryland
- Typical check
- $375K
- Past investments
- 11
Notable investments
How to reach Mark Josephson
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Frequently Asked Questions
What does Mark Josephson invest in?
Mark Josephson invests in Mobility & Logistics, EdTech, SaaS & Enterprise and Marketing & AdTech, typically at Early Stage Venture, Pre Seed, Seed and Late Stage Venture. Match your sector and stage, then reach out with a personalized pitch.
What stage does Mark Josephson invest at?
Mark Josephson typically invests at Early Stage Venture, Pre Seed, Seed and Late Stage Venture. Lead with traction that fits the stage when you reach out.
What is Mark Josephson's typical check size?
Mark Josephson typically writes checks around $375K. Use it as a signal for whether your raise fits their stage.
How do I contact Mark Josephson?
Unlock Mark Josephson's verified email on Round Funded Accelerator and send a personalized pitch. We surface only deliverable contacts so your outreach lands.