Neil Somerville is the author of Your Chinese Horoscope for Each and Every Year, published by Thorsons

Holiday Mathis learned about the heavenly stars while meeting the earthly ones during her 13-year apprenticeship with celebrity astrologer Joyce Jillson. Jillson taught her to chart predictions, and Holiday worked with Jillson's extensive celebrity clientele, specializing in music industry clients such as producers, artists, songwriters and industry executives. She became known as "the Rock 'n' Roll Astrologer" by predicting hot CD release dates and fortuitous artist/producer combinations for some of the biggest artists on the Billboard charts.