Excellence is the asymptotic state that never quite reaches perfection.

The economists who have put the spotlight on teacher quality are the ones who most misunderstand it.

Professional trust is a process, not a state.

In high performing countries, principals are working with highly qualified teachers who come from the top tiers of the graduation range, who have been rigorously prepared in universities and through supervised practice in schools, and who remain in education for all of their careers.

It's important to be innovative when times are prosperous. It's essential to be innovative when they are not.

Sustainable leadership does no harm to and actively improves the surrounding environment.

The rules of the world are changing. It is time for the rules of teaching and teachers' work to change with them.