Gertrud Wölke, MHP, Collaborative Practice Practitioner, 1^st Chairman of DVCP, is a psychologist and psychotherapist. For over 30 years ago she was trained as mediator at the Salzburg Institute for Mediation. Since 18 years she works as a CP professional. Trudel is a trainer for the cooperative practice, a supervisor and trainer for supervision. She leads offices for psychotherapy, mediation and supervision in Germany and Austria.