Robert Powell was born in Reading and studied mathematics at the University of Sussex. He is a eurythmist and movement therapist living in Kinsau, Germany. Powell is the author of numerous books and articles and is a co-founder of the Sophia Foundation of North America. David Bowden is a high school teacher in Steiner Waldorf schools in Australia. He is currently a researcher and teacher of projective geometry and the new Goethean physics.