Catherine Ducommun-Nagy, M.D., is a Clinical Associate Professor of Couple and Family Therapy in the College of Nursing and Health Professions at Drexel University, Philadelphia, USA. A child and adult psychiatrist trained in Switzerland, she specializes in contextual therapy. She writes extensively on the approach and her work has been published in several languages. She is a frequent invited speaker at international family therapy conferences and has intervened as a guest teacher in over twenty countries around the world.