Russ Hudson is the world's leading author and scholar on the Enneagram, a map of personality and personal development. He has co-authored several best-selling books including The Wisdom of the Enneagram and Personality Types as well as a scientifically-validated test instrument, the Riso-Hudson Type Indicator (RHETI). He is president of Enneagram Personality Types, Inc. and co-founder of The Enneagram Institute, and has been teaching professional trainings on these topics since 1991. He is also a founding director and former vice-president of the International Enneagram Association—a global organization advancing knowledge of the subject. He holds a degree in East Asian Studies from Columbia University in New York, from which he graduated Phi Beta Kappa.