 I worked at the United Nations for several years, I was at Columbia University, I was running an organization called Millennium Promise. All focused on the Millennium Development Goals and different aspects. This year I'm a senior fellow at the UN Foundation and also a non-resident senior fellow at the Brookings Institute. I think friendships are the deepest part because there are so many people who are publicly minded coming up with creative approaches to different problems around the world and it really is global. It's people who are dynamic, action-oriented and thinking about problems in their community or from their perspective on a global issue. I just find it interesting to connect every year or in some occasions many times a year with these different people who are taking on problems that they're inspired to find new solutions to. Ultimately I think about leadership as someone helping to solve broader problems that are bigger than themselves and often that entails spotting a problem that people haven't seen. Often it entails finding a solution that people haven't thought of. Often it means coupling a problem and a solution with people who want to put it into action.