In 2013, the International Rescue Committee were looking for a new CEO, and at the interview panel I said that I was applying for the job firstly because I thought some of the questions at the intersection of foreign policy and humanitarian aid were some of the most difficult questions in global public policy. How do you get aid into Syria? How do you educate kids in Afghanistan? How do you tackle sexual violence in the Congo? Those are difficult questions, and I like difficult questions.

Don't make the mistake of confusing net worth and self-worth.

Many forms of entrepreneurship don't lead to wealth, and but they are no less entrepreneurial.

I owned a US$500 million hedge fund when I decided to retire from Wall Street. On paper, I was on top of the world. Inside, though, something was missing. All of the money and material things in the world could never fill that void. It was painful to admit, but I had climbed up to the top of the wrong mountain.

The Convention on the Rights of the Child is not just a document - it's a promise we made to every child on this planet that they matter, that their voices count.