Tyl has written the definitive professional manual in the astrology counseling field, the 1,000 page Synthesis & Counseling In Astrology; is consulted regularly by individuals and corporations throughout the world, and directs the Master's Degree Correspondence Course for Certification of professional astrologers from his office in the Phoenix, Arizona area.
Tyl, a Harvard University graduate, is also the Presiding Officer of AFAN ( The Association for Astrological Networking), astrology's world organization. His most recent titles include Solar Arcs, Predictions for a New Millennium, and Astrology of Intimacy, Sexuality, & Relationship, all published by Llewellyn Publications.