Nicholas Stern is IG Patel Professor of Economics and Government at the London School of Economics, among other positions, and former Chief Economist at the World Bank.

He is also a massive boxing fan and chooses the life of Muhammad Ali to explore with Matthew Parris and sports journalist and boxing commentator Ronald McIntosh.

Not only does Stern admire Ali's prowess in the ring, but more so his fearless stance against the Vietnam War which cost him dearly both personally and professionally.

Ali's humanitarian work in later life has also been a huge source of inspiration to him.

Producer: Maggie Ayre

First broadcast on BBC Radio 4 in September 2017.