Putin is behaving in a very dangerous way. And Donald Trump sounds as though he would simply sit back and allow that to go on. I worry about where that would end up.

I told my father I had to try political science for a year. He thought I was throwing my life away.

One of the things that ultimately led me to leave mathematics and go into political science was thinking I could prevent nuclear war.

The absence of Saddam is a huge weight off the Arab world.

Donald Trump seems to be unconcerned about the Russian aggression in Ukraine. By doing this he tells them that they can go ahead and do what they are doing. That is dangerous.

Public action should seek to expand the set of opportunities of those who have the least voice and fewest resources and capabilities.

The most striking thing is that even before Osama bin Laden was killed, he seemed largely irrelevant to the Arab Spring.