Ellen Evert Hopman is a master herbalist and lay homeopath, who has been a Druidic initiate since 1984. She is a founding member of the Order of the White Oak and its former co-Chief, the Archdruidess emerita and founder of Tribe of the Oak, a former professor at the Grey School of Wizardry, and a member of the Grey Council of Mages and Sages. She is the author of Celtic herbals and Druid novels, including A Druid’s Herbal for the Sacred Earth Year, Secret Medicine from Your Garden, The Sacred Herbs of Samhain, The Sacred Herbs of Yule and Christmas, and Once Around the Sun. She lives in Massachusetts.