David has run a publicly-listed company, was the youngest global CEO in the history of the ad industry, co-founded the world's leading charity for young leaders, created a unicorn tech start-up that is now the world’s #1 digital-only and Gen AI marketing group, and has been an early investor in some of the world's hottest tech and AI companies. All this, plus advising the UK Prime Minister, leading Kofi Annan's climate campaign, writing a best-selling 2011 book on why business needs to be a force for good and being named by The Guardian as its Global Sustainable Business Leader.