Justine van Lawick is a Clinical Psychologist and registered Psychotherapist. She specialized in Systemic Therapy. From 1975 on she worked as a Family Therapist in adult psychiatry and child psychiatry. In 1984 she was co-founder of the LORENTZHUIS, centre for systemic therapies, training and consultation in Haarlem, the Netherlands. She is an experienced trainer in the Netherlands and abroad. She edited and published many papers and books. She became a specialist in systemic work with violence problems in families. Together with Martine Groen, she developed a systemic model for conjoint work