No matter how good you think you are as a leader, my goodness, the people around you will have all kinds of ideas for how you can get better. So for me, the most fundamental thing about leadership is to have the humility to continue to get feedback and to try to get better - because your job is to try to help everybody else get better.
What I learned from my work as a physician is that even with the most complicated patients, the most complicated problems, you've got to look hard to find every piece of data and evidence that you can to improve your decision-making. Medicine has taught me to be very much evidence-based and data-driven in making decisions.
I think one of the main challenges that the World Bank faces is creating an organizational structure that doesn't get in the way of its staff. We have fantastic staff. People told me as I was coming into the organization that the greatest asset of the World Bank Group is its staff, and I think there's no question that that's the case.