Gary Goldschneider (1939–2019) was an American-born writer, personologist, pianist and composer, best known for The Secret Language of Birthdays (1994), written with Joost Elffers, which combined astrology, numerology and tarot with his own study of more than 14,000 people to produce a personality profile for every day of the year. He followed it with The Secret Language of Relationships and The Secret Language of Destiny, and continued writing and updating titles in the Secret Language / Person...