Roland S. Barth Roland S. Barth is one of the country's most renowned educators and the author of the best-selling Jossey-Bass book "Improving Schools from Within" (over 100,000 copies sold). He has been a public school teacher and principal, recipient of a Guggenheim Fellowship, and a member of the faculty of Harvard University where he founded the Harvard Principals' Center and the International Network of Principals' Centers.