Ellen Evert Hopman is the author of a number of books and has been a teacher of Herbalism since 1983 and of Druidism since 1990. She has presented on Druidism, herbal lore, tree lore, Paganism and magic at conferences, festivals, and events in Northern Ireland, Ireland, Scotland, Canada, and in the United States. She is currently Archdruid of Tribe of the Oak (http: //tribeoftheoak.com/) an international Druid teaching Order based in New England, USA.