The scientific understanding of some of these [childhood] diseases is advancing quite rapidly. There's some things like premature birth or nutrition, first day deaths that we need a lot more insights so that we can build the tools to solve those problems.

In low-income countries, getting to a health post is hard. It's very expensive.

The outside perception and inside perception of Microsoft are so different. The view of Microsoft inside Microsoft is always kind of an underdog thing.

Our success has really been based on partnerships from the very beginning.

Well, I don't think there's any need for people to focus on my career.

India just went 3 years with no cases [of polio]. Pakistan is our toughest location right now because some parts of the Taliban have not allowed vaccinators to come in and have even attacked vaccinators. We are hopeful this will get resolved since no one wants their kid to be paralyzed. I spend a lot of time making sure the polio campaign is doing the best it can. We have great computer models that help guide our activities.

Natural epidemics can be extremely large. Intentionally caused epidemics, bioterrorism, would be the largest of all.