An edited version of the interview and a subsequent phone conversation follow:

Q. In your book you posit that organizations made up of different types of people are more productive than homogenous ones. Why do you say that?

A. Because diverse groups of people bring to organizations more and different ways of seeing a problem and, thus, faster/better ways of solving it.

People from different backgrounds have varying ways of looking at problems, what I call “tools.” The sum of these tools is far more powerful in organizations with diversity than in ones where everyone has gone to the same schools, been trained in the same mold and thinks in almost identical ways.

The problems we face in the world are very complicated. Any one of us can get stuck. If we’re in an organization where everyone thinks in the same way, everyone will get stuck in the same place.

But if we have people with diverse tools, they’ll get stuck in different places. One person can do their best, and then someone else can come in and improve on it. There’s a lot of empirical data to show that diverse cities are more productive, diverse boards of directors make better decisions, the most innovative companies are diverse.