Hedge fund magnate David Kabiller flicks through photos of his newborn son on his iPhone. He has just come off stage at a conference hosted in AQR’s Asset Management Institute in north London – his other baby – and, at 54, the birth of his first child has put him in a reflective mood.

“I’m really interested in how people become the best version of themselves,” the co-founder of the $208bn quantitative hedge fund firm says. “How do you find your calling, your purpose? I always wanted to be a professional tennis player. You don’t know what you don’t know, when you’re young.”