Stephen began the study of astrology in 1965, opened Circle Books, an astrological bookstore in 1968, and began publishing the Circle Books astrological calendar in 1969. In 1972 he published the Circle Book of Charts, a collection of charts for famous individuals over centuries. For centuries where no ephemeris was available, he had the help of one of the earliest astrological computer programs then being developed by Thomas Shanks. In 1979 he bought a Commodore Pet and taught himself to program. He soon was working on code for Matrix which was started by his brother, Michael. In 1980 he started working full time for Matrix. Stephen Erlewine is the lead programmer at Matrix Software. He lives in Big Rapids, Michigan and can be reached at: rse.matrix@@gmail.com.