Marc completed training in curative education in Camphill Perceval, Switzerland, before moving to Camphill Village in Copake, New York. He has worked as a teacher, farmer, bookbinder, homemaker, and a gardener. For the past 14 years, he has been the head gardener of the Healing Plant Gardem in Copake. During these years the focus of his activity has been on biodynamic research and training and soil management. He is a mentor gardener for the BDA's farmer training program and has a particular interest in forming spaces of encounter between human and nature. In this context, he has taught and served as a consultant in Vietnam. He has been on the core faculty of the Social Therapy Program in Copake since 2008 and is responsible for various courses on general anthroposophy and art, the senses, phenomenology, the life phases, organizational development, drama, and clay. He also serves as a member of the Collegium of the Camphill Academy.