Christine Shahin, author of Natural Hair Coloring, is a licensed cosmetologist and holistic beauty practitioner who owns and operates a popular eco-salon/spa that attracts clients from across the United States. She has a conventional cosmetology license, though her interest and focus have always been on introducing natural, safe, ecologically responsible approaches to self care. She continues to offer classes on natural hair and skin care topics, including coloring hair with pure plant pigments. Rosemary Gladstar is the best-selling author of Rosemary Gladstar's Medicinal Herbs: A Beginner's Guide and Rosemary Gladstar's Herbal Recipes for Vibrant Health, which draw on her 40-plus years of experiences studying and teaching about the healing properties of herbs. She is a world-renowned educator, activist, and entrepreneur, and the founding director of Sage Mountain Herbal Retreat Center, the International Herb Symposium, and the New England Women's Herbal Conference. Gladstar is founding president of United Plant Savers, a nonprofit organization dedicated to the conservation and preservation of native American herbs. She was the original formulator for Traditional Medicinal herbal teas and has led herbal educational adventures around the world. She is the recipient of an honorary doctorate from the National University of Natural Medicine in Portland, Oregon, and serves on the board of the Association for the Advancement of Restorative Medicine and The National Health Freedom Coalition. She lives in Vermont.