William Douglas Horden is a master diviner who works with the I Ching and pre-Hispanic MesoAmerican sacred tools, having studied extensively with Khigh Alx Dhiegh and with Tarahumara shamans in Mexico's Copper Canyon. He is the co-author The Toltec I Ching, author of numerous books and articles on divination and spirituality, a regular blogger for The Huffington Post and other online publications, and has been a guest on a variety of radio programs. He lives part of the year in Roseburg, Oregon, part of the year in Coatepec, Mexico, and spends part of the year traveling.