Don Richard Riso was an American teacher of the Enneagram of Personality who wrote and co-wrote a number of books on the subject. Wikipedia
Born: January 17, 1946, United States
Died: August 30, 2012 (age 66 years), Stone Ridge, NY
Books
La Sabiduria del Eneagrama
1999
Personality Types: Using the Enneagram for Self-discovery
1987
Understanding the Enneagram: The Practical Guide to Personality Types
1990
Discovering your personality type
1992
Discovering Your Personality Type: The Essential Introduction to the Enneagram
2003
Enneagram Transformations: Releases and Affirmations for Healing Your Personality Type
1993