Grace Cassy
InvestorPartner & Executive Chair of Security Trust and Resilience Network at Ten Eleven
United Kingdom
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141 people in our graph share verified history with Grace — schools, employers, funds. One of them is your warm intro.
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
- Ten Eleven VenturesPartnercurrent2026 — present
- Ten Eleven VenturesAdvisory Board Member2022 — 2026
- European Council on Foreign RelationsCouncil Membercurrent2024 — present
- Chatham HouseAssociate Fellowcurrent2023 — present
- CyLonCo-Founder2015 — 2026Hammersmith, London
- UK Ministry of DefenceStrategic Defence Review 20252024 — 2025
- Sequoia CapitalScout2021 — 2024
- Epsilon Advisory PartnersCo-Founder2013 — 2023
- Cassy PartnersFounder2008 — 2013
- Foreign and Commonwealth OfficeDiplomat1998 — 2008
- 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
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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).
Shared employers
Also worked at Ten Eleven Ventures16
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+ 10 more
Also worked at European Council on Foreign Relations2
Also worked at Chatham House3
Also worked at UK Ministry of Defence11
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+ 5 more