Rudolf Steiner (1861-1925) was born in the small village of Kraljevec, Austro-Hungarian Empire (now in Croatia), where he grew up. As a young man, he lived in Weimar and Berlin, where he became a well-published scientific, literary, and philosophical scholar, known especially for his work with Goethe's scientific writings. At the beginning of the twentieth century, he began to develop his early philosophical principles into an approach to systematic research into psychological and spiritual phenomena. Formally beginning his spiritual teaching career under the auspices of the Theosophical Society, Steiner came to use the term Anthroposophy (and spiritual science) for his philosophy, spiritual research, and findings. The influence of Steiner's multifaceted genius has led to innovative and holistic approaches in medicine, various therapies, philosophy, religious renewal, Waldorf education, education for special needs, threefold economics, biodynamic agriculture, Goethean science, architecture, and the arts of drama, speech, and eurythmy. In 1924, Rudolf Steiner founded the General Anthroposophical Society, which today has branches throughout the world. He died in Dornach, Switzerland. Roberto Trostli has been active in Waldorf education for more than twenty years, teaching lecturing, leading workshops, consulting, and writing. He is the author of numerous articles, a dozen plays for children, and the classic Physics Is Fun! A Sourcebook for Teachers. He received his B.A. from Columbia University, which awarded him a fellowship for graduate study in medieval languages and literature at the University of Cambridge, England. When he returned, he worked for several years as a violin maker, before becoming a class teacher at the Rudolf Steiner School in New York City, which he had attended as a child. After ten years, he moved to western Massachusetts, where he is a class teacher at the Hartsbrook School.