Darby studied psychology, philosophy and theology in New York, and astrology in Boston. She then went to Africa and worked with tribal healers and diviners for seven years, while building her astrological practice.
Based in London since the early 1980s, she was Head Tutor at the Centre for Psychological Astrology for many years.
Darby has written several books, including the recently re-issued Water and Fire and Earth and Air.
In 2006 she was awarded an MA in Cultural Astronomy and Astrology from Bath Spa University. Her consultation practice is at the very heart of her working life as an astrologer.