US Energy Secretary (2013–2017) - Ernest Moniz
How significant will President Trump’s U-turns on Obama-era agreements prove to be?
Zambia's Opposition Leader - Hakainde Hichilema
Is Zambia's opposition leader destabilising the country?
CEO of The King Center - Dr Bernice A King
Does the daughter of Martin Luther King believe racism is on the rise again in the US?
Former Judge, South Africa Constitutional Court - Albie Sachs
He says the post-apartheid constitution is one of the world's best. Why do some disagree?
Professor of Robot Ethics Alan Winfield
Are we creating machines which could turn the dark visions of science fiction into fact?
Shadow Foreign Secretary, UK - Emily Thornberry MP
What would the UK opposition party do about Brexit?