He was a former car salesman, although he eventually founded the Children of the Sun cult sometime later. He sold himself as the eternal one, not even receiving the common cold. However, he had a private doctor give him cortisone shots due to having a bad back in secret.
He later appears in "Mr. Monk's 100th Case". It's implied he committed a crime after "Mr. Monk Joins a Cult" (as he is in prison in "Mr. Monk's 100th Case"), but could have gone to jail because he said by being in a cult with no crouches while he had a private doctor.