Sergei O. Prokofieff (1954-2014) was born in Moscow, where he studied fine arts and painting at the Moscow School of Art. At an early age he encountered the work of Rudolf Steiner and quickly realized that his life would be dedicated to the Christian path of esoteric knowledge. He wrote his first book, Rudolf Steiner and the Founding of the New Mysteries, while living in Soviet Russia, and it was published in English in 1994. After the fall of Communism, he helped establish the Anthroposophical Society in Russia. In 2001, he became a member of the Executive Council of the General Anthroposophical Society at the Goetheanum in Switzerland. More than 30 of his books have been translated into English. Sergei Prokofieff passed away in Dornach, Switzerland. Peter Selg was born in 1963 in Stuttgart and studied medicine in Witten-Herdecke, Zurich, and Berlin. Until 2000, he worked as the head physician of the juvenile psychiatry department of Herdecke hospital in Germany. Dr. Selg is now director of the Ita Wegman Institute for Basic Research into Anthroposophy (Arlesheim, Switzerland) and professor of medicine at the Alanus University of Arts and Social Sciences (Germany). He lectures extensively and is the author of numerous books, many of which have been published in English.