The biggest opportunity in 2013 is in Africa. It has seven out of the ten fastest-growing economies in the world. In Nigeria alone there are 100 million people with mobile phones. In total, 300 million Africans - five times the population of Britain - are in the middle class.

One thing that I feel very, very strongly is that we talk about Islamic countries, Islamic people, Islamic leaders, as either moderates or extremists. It's almost like there are only two categories of Muslims. And actually, that doesn't show respect. It shows lack of understanding of the diversity of Muslim thought.

The two biggest threats to international security in 2013 are Iran getting a nuclear weapon, and Iran being bombed to stop it getting a nuclear weapon. Both would precipitate a long and dangerous conflict in an already unstable Middle East. Both would be a disaster.

History is information. Memory is part of your identity.

I learned so much in Zimbabwe, in particular about the need for humility in our ambition to extend mental health care in countries where there were very few psychiatrists and where the local culture harboured very different views about mental illness and healing. These experiences have profoundly influenced my thinking.

My job is writing. I get paid to do it. When was the last time you heard someone challenge a doctor for making money off of cancer?

Many politicians, celebrities, businessmen and women, and community leaders now are open about their struggles with mental illnesses, something almost unheard of when I began. Together, we are spreading the word that mental health affects all of us and deserves our support and attention.

Basketball is my first love. If my health had permitted me, I would still be playing, but I am glad in retrospect that everything happened the way it did.