Neil F. Michelsen, founder of Astro Computing Services and ACS Publications, contributed his programming expertise, astronomical knowledge, compassion and wisdom to the field of astrology for almost 20 years.

He served as Chairman for the National Council for Geocosmic Research and provided computer, technical, financial and personal support to many astrological researchers (including the Gauquelins and John Addey).

His American Ephemeris for the 20th Century is the most widely read ephemeris in the world, and all of his twenty other books and tables are noted for being the most accurate references available.