From 2007 until 2012 he was the managing and international partner of the advisory arm of Best Companies, which produces The Sunday Times' Top 100 Companies lists.
He began his career at Deloitte and went on to help BDO, the fifth-largest accounting network, to achieve a top 20 ranking in The Sunday Times' Best Companies lists.
Clarke is an economics graduate and has spent more than 16 years helping to improve the performance of organisations through improved people engagement.
He works throughout the world designing and delivering strategic growth-focused programmes within the private and public sector. To date he has worked with more than 600 CEOs and boards and thousands of managers in more than 30 countries.
Clarke is an international keynote speaker and is a visiting lecturer on the MBA programme at Cass Business School in London and Dubai.
In 2012 at the New York JCI/UN Partnership Summit he was formally recognised as a JCI Ambassador for his work in promoting the principles of JCI and the United Nations Foundation. Previous recipients of this ambassadorship include former UN secretary general Ban Ki-Moon. In July 2014 he was invited to speak alongside Chelsea Clinton at the UN in New York.