Ian Bremmer is Editor-at-Large and global affairs columnist at TIME magazine, and the Founder and President of Eurasia Group, a leading political risk research/consulting firm, with offices in seven countries. In this in-depth interview he argues Trump, Brexit, refugee crises and Isis have resulted in the worst geopolitical environment since World War II; why experts need to take responsibility for failing to make the case during the Brexit and US election campaigns - including himself; and why despite analysing an increasing number of global crises... he is still an optimist.