Amy Zerner and Monte Farber are duo of writers and illustrators active in the fields of astrology and spirituality. As a married couple, they have written over 50 books, achieved sales of more than 3 million copies, and been cited as among the world's foremost designers of astrological publications, oracle and divination systems, and related products. Farber serves as the primary author, while Zerner both writes and illustrates. The couple published their first book in 1988, and have subsequently released their work throughout the world with publications in 18 languages.