Kieron Boyle is the Chief Executive of the Impact Investing Institute, the UK’s national body for impact investing. Its mission is to change capital markets for a fairer, greener economy.

From 2016 to 2023, Kieron was the Chief Executive of Guy's and St Thomas' Foundation, one of the world's oldest health foundations. Through this period, the foundation developed some of the UK’s most innovative and impactful alliances to reduce health inequalities, as well as transformed its £1 billion investment arm into one of Europe's leading responsible and health impact investors.

Kieron was formerly the UK government's chief advisor on impact investment, and prior to that worked in both Downing Street and the Foreign Office. He started his career at the Boston Consulting Group.

Kieron is a Governor of the Southbank Centre, Europe’s largest arts centre; and on the Boards of Big Society Capital and the Design Council. He chairs LIPH — a multi-trillion dollar global alliance of institutional investors working to improve people's health — and the UK's Cultural Impact Development Fund.