Cerridwen Greenleaf has worked with many of the leading lights of the spirituality world including Starhawk, Z Budapest, John Michael Greer, Christopher Penczak, Raymond Buckland, Luisah Teish, and many more. She gives herbal workshops throughout North America. Greenleaf's graduate work in medieval studies has given her deep knowledge she utilizes in her work, making her work unique in the field. Her latest books for Running Press are bestsellers, selling over 70,000 copies.