Taking smart risks can be very gratifying.

Taking smart risks can be very gratifying.

Stone Age. Bronze Age. Iron Age. We define entire epics of humanity by the technology they use.

The best managers figure out how to get great outcomes by setting the appropriate context, rather than by trying to control their people.

Don't be afraid to change the model.

When you grow up, as I have, in the shadow of Steve Jobs, Bill Gates and others, success is defined as the total global transformation of a market. To achieve that, you need low prices and an attractive offering. It's about trying to make a positive impact on a big scale.

About half my work in education is U.S. political reform around school districts and charter schools, and creating more room for entrepreneurial organizations to develop. And about half on technology, which I look at as a global platform.