David Mullings was always a self-starter. Born in Jamaica, he moved to Florida to go to university, and founded his first company – a digital media firm that helped Caribbean content find a wider audience – before finishing business school at the University of Miami. In 2011, he opened a private-equity firm with his brother. In 2013, the two made their first big deal, acquiring an 80 per cent stake in a Tampa-based producer of mobile apps. A year later it blew up in their faces, sinking their firm and their hopes.

Mullings struggled to recover from the blow. The odd consulting gig provided a distraction and some income. Yet depression set in as he found himself asking whether he had anything useful to contribute to the wider world.