Epsilon advises clients operating at the intersection of technology, government, enterprise and society.

Through our global network, we support our clients' international growth through innovative commercial, intellectual and social partnerships.

Our senior team has experience at the highest levels of government and business.

In 2015, Epsilon's Founding Partners also established CyLon, Europe's first cyber security accelerator and incubator space. CyLon welcomes start-ups building global-scale cyber security businesses with innovative technology, and helps them develop their skills, products, sales and investment-readiness. CyLon's alumni have gone on to secure investment from some of the world's leading investors, and count FTSE100 and other global companies amongst their clients.

Grace Cassy
Founding Partner

Grace co-founded Epsilon Advisory Partners in 2013, providing advice to the leadership of fast-growing technology companies on GTM, partnerships, and policy. Grace also co-founded CyLon, Europe’s leading early stage investment platform and community for startups in security and resilience. Prior to this, she spent 10 years in the UK Diplomatic Service. Between 2004-06, she was a foreign policy adviser to Prime Minister Tony Blair in 10 Downing Street specialising in Asia, EU and national security. She has lived and worked in London, Islamabad and Brussels.
Jonathan Luff
Founding Partner

Jonathan is the co-founder of Epsilon Advisory Partners, and CyLon, advising and investing in outstanding technology companies since 2013. From 1998-2012 he served in the British Diplomatic Service, and as an advisor to the Prime Minister at 10 Downing Street, specialising in national security issues, technology and innovation. He has lived and worked in London, Paris, Cairo, Riyadh, and Baghdad.
Kerry Gregory
Chief of Staff

Kerry joined the Epsilon team in 2016. During her career in government she served as Private Secretary and Organiser-in-Chief to Cabinet Ministers and Ambassadors, both in London and overseas. Kerry makes things happen, ensuring the Epsilon machine works smoothly, efficiently, and to the high standards our clients expect.

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Epsilon Advisory Partners is a limited company registered in England and Wales.
Registered Address: 9 Thorney Leys Park, Witney, Oxfordshire, OX28 4GE.
Registered No.12085284