Christy Turlington

I remember doing a shoot for Herb Ritts, hanging off the Eiffel Tower - that wasn't your usual day at the office. It was terrifying, and in the end, you couldn't really tell how high I was because the photographer was scared of heights, so he was quite far away from me.

The biggest public health challenge is rebuilding health systems. In other words, if you look at cholera or maternal mortality or tuberculosis in Haiti, they're major problems in Haiti, but the biggest problem is rebuilding systems.