Grace Cassy in

Grace Cassy

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Partner at Ten Eleven Ventures
📍 United Kingdom

Grace Cassy is a Partner at Ten Eleven Ventures, focusing on early-stage investments in cybersecurity, resilience, and defense technologies. A Cambridge University graduate, she leverages a unique background as a former UK diplomat and foreign policy advisor to Prime Minister Tony Blair, blending deep geopolitical insight with venture capital expertise.

Her career reflects a sustained commitment to national and global security, evidenced by her roles as an Associate Fellow at Chatham House and a Council Member of the European Council on Foreign Relations. She co-founded CyLon, a leading cybersecurity investor, and frequently speaks on the intersection of technology and security.

Before entering venture capital, Grace spent a decade as a UK diplomat, serving as the Foreign Policy private secretary to Prime Minister Tony Blair.

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Experience
24 Years
Current Role
Partner
Job Level
Mid-senior
Location
United Kingdom
Personality Overview

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Communication Style
Decision Approach
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Priorities

Topics Grace cares about

Cybersecurity Investing
Co-founded CyLon, a leading seed-stage cyber investor, and now serves as a Partner at cybersecurity-focused VC firm Ten Eleven Ventures.
National Security
Served 10 years as a UK diplomat, was an advisor to PM Tony Blair, and was an external reviewer for the UK's 2025 Strategic Defence Review.
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Career

Work history

1-2026
Partner
Ten Eleven Ventures
9-2024 - 3-2025
Strategic Defence Review 2025
UK Ministry of Defence
2-2024
Council Member
European Council on Foreign Relations
2-2023
Associate Fellow
Chatham House
5-2022 - 1-2026
Advisory Board Member
Ten Eleven Ventures
In the press

Media appearances

Ten Eleven Ventures Appoints Grace Cassy as Partner. Featured in Business Wire
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Education
1994 - 1997
BA
Trinity College, Cambridge University
Social presence
in
Behavioral profile

DISC profile (public)

DISC behavioral profile

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