Valentino Achak Deng was once a “Lost Boy”, a small, frightened child who walked for months across what is now South Sudan to flee a brutal war, narrowly escaping becoming another casualty of the conflict.
He lived in refugee camps in Ethiopia and Kenya, getting the education he had missed on his terrifying journey, before he was eventually relocated to the US.
Mr Deng’s life story was made into a bestselling book, What is the What, by the American author Dave Eggers.