Sir Martin Sorrell is Founder and Executive Chairman of S4 Capital plc, the tech led, new age / new era digital advertising and marketing services company for global, multinational, regional and local clients, and millennial-driven influencer brands.

Sir Martin was Founder and CEO of WPP for 33 years, building it from a £1 million ‘shell’ company in 1985 into the world’s largest advertising and marketing services company. When Sir Martin left in April 2018, WPP had a market capitalisation of over £16 billion, revenues of over £15 billion, profits of approximately £2 billion and over 200,000 people in 113 countries. Prior to that, Sir Martin was Group Financial Director of Saatchi & Saatchi plc for nine years and worked for James Gulliver, Mark McCormack and Glendinning Associates before that.

In 2018, S4Capital merged with MediaMonks, the leading AdAge A-listed creative digital content production company, and then with MightyHive, the market-leading digital media solutions provider for future thinking marketers and agencies. Since then, MediaMonks and MightyHive have combined with more than 30 companies.

In August 2021, S4Capital launched its unitary brand by combining MediaMonks and MightyHive into Media.Monks. As the operational brand, Media.Monks underpins S4Capital's agility, digital knowledge and efficiency and is the next step in delivering on its foundational promise to unify Content, Data&digital media and Technology services with over 8,000 people in 32 countries. S4Capital is listed on the London Stock Exchange under SFOR.L.

Sir Martin supports a number of leading business schools and universities, including his alma maters, Harvard Business School and Cambridge University, and a number of charities, including his family foundation. He was ranked the second best-performing CEO in the World by the Harvard Business Review in 2016 and 2017, and received the Harvard Business School Alumni Achievement Award. He has also been nominated as one of the TIME 100: The Most Influential People. He is also an Honorary Fellow of Christ’s College, Cambridge and a Director of Bloomberg Philanthropies.