City Year is taking on some of the toughest work in education.

If the goal is to dramatically improve college completion rates, not college-going rates by itself but college completion, it's not just a college problem. We need a big focus on early childhood education. Our early childhood education system is pretty good in this country. Not enough students have opportunity. And, very discouragingly, they lose their advantage because they go to poor schools after that. So, let's focus on our babies.

We need to invest in very different ways. Get the students the support they need, get them the best principals, get them the great teachers, and I promise you those students would do extraordinarily well. I have seen it all my life.

Teachers say their schools of education did not adequately prepare them for the classroom. They would have welcomed more mentoring and feedback in their early years.

I just think we can't do enough of this [student exchanges]... And when you get young children traveling internationally, I think they come back different people. And you can't put a price tag - you can't put a value on that.

Money is not the reason that people enter teaching.

I think every student needs access to technology, and I think technology can be a hugely important vehicle to help level the playing field.