Dr. Bernard Jensen was one of America's pioneering nutritionists and iridologists. Beginning his career in 1929 as a chiropractor, he soon turned to the art of nutrition for his own health problems. He observed firsthand the cultural practices of people in more than fifty-five countries, discovering important links between food and health. In 1955, Dr. Jensen established the Hidden Valley Ranch in Escondido, California as a retreat and learning center dedicated to the healing principles of nature where he saw firsthand the value of nutrition and iridology.

Over the years, Dr. Jensen received many honors and awards, including Knighthood in the Order of St. John of Malta; the Dag Hammarskjold Peace Award of the Pax Mundi Academy in Brussels, Belgium; and an award from Queen Juliana of the Netherlands for his nutritional work. In 1982, he also received the National Health Federation's Pioneer Doctor of the Year award.

Mark Anderson is a recognized authority on the topics of global ecology and wholistic health. He has spent years traveling the world to study and teach clinical nutrition from the soil up. His stimulating and informative lectures on traditional diets, health patterns of native peoples, and agriculture have been featured at seminars and conferences in Africa, Asia, Europe, and India, as well as throughout the United States and Canada. Mark's articles about natural approaches to nutrition and health have been published in scores of professional health journals in the United States.