Philippe Costeletos
Chairman
Philippe Costeletos joined the Board as a non-executive Director in July 2017 and became Chairman in May 2025. He is Chair of the Nominations committee and a member of the Conflicts, Remuneration, and Valuation Committees.
He has over 30 years’ of private investment and board governance experience and is Founder of Stemar Capital Partners (SCP), a private investment firm focused on building long-term investment platforms. Philippe was formerly a Senior Advisor of the Blackstone Group and Chair of International at Colony Capital. Previously, he was Head of Europe at TPG and a member of TPG’s Global Management and Investment Committees. Prior to that, Philippe was a Member of the Management Committee at Investcorp. Previously, Philippe held positions at JP Morgan Capital, JP Morgan’s Private Equity Group and Morgan Stanley.
Philippe is Chair of Clinica Tambre and Zeno Partners and a board member of AutoHellas, Colosseum Dental Group, Vangest Group and Generation Home. Philippe serves as a member of the Yale University Council and the President’s Council on International Activities. He graduated magna cum laude with a BA with distinction in Mathematics from Yale University and received an MBA from Columbia University.