DON RICHARD RISO, M.A. (1946-2012) was the foremost writer and developer of the Enneagram in the world and the most-published and bestselling author in the field. The president of Enneagram Personality Types, Inc., and co-founder of The Enneagram Institute, he taught the Enneagram for more than twenty years, pioneering a revolutionary new approach to ego psychology through his 1977 discovery of the Levels of Development. His five bestselling books with Russ Hudson have been published in more than a dozen countries and languages. Mr. Riso was a Jesuit for thirteen years, with degrees in English and philosophy, was elected to the Jesuit Honor Society, Alpha Sigma Nu, and was a Ford Foundation Fellow at Stanford University in communications (social psychology).