It was Oscar Ichazo who originally placed the types on the Enneagram symbol sometime during the 1950s and 1960s. He created a number of different enneagrams (or enneagons as he sometimes called them). The Enneagram personality types of today evolved primarily from five of his enneagrams: the Enneagram of Fixations, Traps, Holy Ideas, Passions, and Virtues. Although much of today's Enneagram of personality types evolved from Ichazo's enneagrams and related concepts, he was not part of that evolution. He used his enneagram material in the Arica Institute trainings while the personality types of today evolved along a separate path during the 1970s.
Dave's Enneagram is going through a major redesign and is a work in progress.
For additional resources visit the old website at davesenneagram.com/d7/home.