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Grace Cassy

Investor

Partner & Executive Chair of Security Trust and Resilience Network at Ten Eleven

United Kingdom

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About

Grace Cassy is a Partner at Ten Eleven Ventures, focusing on seed and early-stage investments in cybersecurity, resilience, and defense technology, including in Israel, and serves as Executive Chair of the firm's Security Trust and Resilience (STAR) network. She previously co-founded CyLon, an early-stage investor in security startups, and spent ten years in the UK Government, including advising Prime Minister Tony Blair on foreign policy and national security. She later acted as an external reviewer for the UK Government's 2025 Strategic Defence Review.

Invests in

CybersecurityDefense Tech

Experience

  1. Ten Eleven VenturesPartnercurrent2026 — present
  2. Ten Eleven VenturesAdvisory Board Member2022 — 2026
  3. European Council on Foreign RelationsCouncil Membercurrent2024 — present
  4. Chatham HouseAssociate Fellowcurrent2023 — present
  5. CyLonCo-Founder2015 — 2026Hammersmith, London
  6. UK Ministry of DefenceStrategic Defence Review 20252024 — 2025
  7. Sequoia CapitalScout2021 — 2024
  8. Epsilon Advisory PartnersCo-Founder2013 — 2023
  9. Cassy PartnersFounder2008 — 2013
  10. Foreign and Commonwealth OfficeDiplomat1998 — 2008
  11. Prime Minister's Office, 10 Downing StreetPrivate Secretary to the Prime Minister2004 — 2006

Skills & more

Languages French · Spanish

From Grace's professional profile.

Colleagues at Ten Eleven

Alex Doll
Investor at Ten Eleven
Andrew J Doll
Partner at Ten Eleven
Ben Charlson
Senior Associate at Ten Eleven
Brian Draves
Partner & COO at Ten Eleven
Collin Mazgaloff
Associate at Ten Eleven
Dani Andrade
Director of Events at Ten Eleven
Dave Palmer
Partner at Ten Eleven
Dixon Doll
Partner at Ten Eleven

Frequently asked questions

Who is Grace Cassy?
Grace Cassy is a Partner at Ten Eleven Ventures, focusing on seed and early-stage investments in cybersecurity, resilience, and defense technology, including in Israel, and serves as Executive Chair of the firm's Security Trust and Resilience (STAR) network. She previously co-founded CyLon, an early-stage investor in security startups, and spent ten years in the UK Government, including advising Prime Minister Tony Blair on foreign policy and national security. She later acted as an external reviewer for the UK Government's 2025 Strategic Defence Review.
Where does Grace Cassy work?
Grace Cassy is Partner & Executive Chair of Security Trust and Resilience Network at Ten Eleven.
What does Grace Cassy invest in?
Grace Cassy invests in Cybersecurity, Defense Tech.
Where did Grace Cassy go to school?
Grace Cassy studied at Trinity College, Cambridge University (BA, History).

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