Martin W. Lewis has taught college-level geography for 20 years, and is currently a senior lecturer at Stanford University. He is a co-author on two leading textbooks in world geography, Diversity Amid Globalization and Globalization and Diversity.

For more on Martin W. Lewis, see http://www.stanford.edu/~mwlewis

Asya Pereltsvaig has taught college-level linguistics for over 10 years, and is now a lecturer at Stanford University. Her recent textbook Languages of the World: An Introduction is published by Cambridge University Press.

For more on Asya Pereltsvaig, see http://www.pereltsvaig.com/