Sergei O. Prokofieff (1954-2014) studied Fine Arts and Painting at the Moscow School of Art. He encountered the work of Rudolf Steiner in his youth, and soon decided to devote his life to it. He became active as an author and lecturer in 1982, and helped found the Anthroposophical Society in his native Russia in 1991.

In Easter 2001 he was appointed a member of the Executive Council of the General Anthroposophical Society in Dornach, Switzerland, a position he held until his death. A popular speaker, he wrote numerous books and articles that are published in many languages.

Born 1963, Stuttgart. 1986-1993 Study of human medicine at the University of Witten/Herdecke, in Berlin and Zurich. Doctoral thesis: Attempt to systematize Rudolf Steiner's human physiological ideas. An analysis of the entire lecture and written work (Witten/Herdecke 1995). 1993-2000 Further training as a specialist in child and adolescent psychiatry and psychotherapy. Senior physician in the psychiatric department for adolescents and young adults at the Herdecke Community Hospital. 2000-2002 Research associate at the Institute for Applied Epistemology and Medical Methodology (Freiburg). 2002-2006 Head physician at the Ita Wegman Clinic Arlesheim (adolescent psychiatry and psychotherapy); since 2006 establishment and management of the Ita Wegman Institute for Basic Anthroposophical Research Since 2007 professorship for medical anthropology and ethics at the Alanus University of Arts and Social Sciences (Alfter near Bonn); teaching in the Studium fundamentale and in the accompanying studies in anthroposophic medicine at the University/Witten-Herdecke Since 2020, Co-leader of the General Anthroposophical Section of the School of Spiritual Science at the Goetheanum, Dornach, Switzerland