When we invest in women, we invest in a powerful source of global development

Any social or cultural change has to be made openly and with people agreeing. You don't get there by just pushing an outsider's point of view.

In places like India with smartphones, there's an app now for women if they're in a violent situation, they can press one button. They've given their cell-phone number to five trusted friends, and right away their GPS location goes out: "Here I am."

I'm wholehearted about whatever I do.

We set out what's going to be our work time versus our foundation time versus family time, and we'll reassess that... sometimes every week.

If you don't invest in the woman, empower her, give her the things she needs to lift her family up, you're just not going to make the progress that you want to make. But if you put her at the centre, you can change a lot for that family, and it has ripple effects through the economy.

If I really believe all lives have equal value, and if I use contraceptives, which I do, and if I'm counselling my son and my two daughters to use them, how am I not serving the women who don't have access to the contraceptives they need?