Ellen Evert Hopman has been a teacher of herbalism since 1983 and is a professional member of the American Herbalists Guild. A member of the Grey Council of Mages and Sages and a former professor at the Grey School of Wizardry, she has presented at schools and workshops across the United States and Europe. A Druidic initiate since 1984, she is a founding member of The Order of the White Oak (Ord Na Darach Gile), a Bard of the Gorsedd of Caer Abiri, and a Druidess of the Druid Clan of Dana. A former vice president of The Henge of Keltria, she is the author of A Druid's Herbal of Sacred Tree Medicine; A Druid’s Herbal for the Sacred Earth Year; Walking the World in Wonder; Being a Pagan; Tree Medicine, Tree Magic; and Priestess of the Forest. She lives in Massachusetts.