Synthesia became famous for creating a video that seems to show David Beckham delivering an anti-malaria message in nine different languages. The London tech firm uses artificial intelligence to transform text documents into training, marketing or sales video. Danish duo Riparbelli and Tjerrild, 33 and 34, founded the firm in 2017. An investment round earlier this year (2025) valued the business at nearly £1.7bn - making it the UK’s most valuable AI company. There are now 400 staff across London, Europe and the US. Riparbelli serves as chief executive. Tjerrild doubles as chief operating officer and chief financial officer.