Gilles Amado, Ph.D., Professor of Organizational Psychosociology at the HEC School of Management, Paris, is known as an expert of transition through two books he co-edited, 'The Transitional Approach to Change', with A. Ambrose and 'The Transitional Approach in Action', with L. Vansina, published in 2001 and 2005 by Karnac and which are indebted to the close work he had been undertaking for more than thirty years with Harold Bridger, a founding member of the Tavistock Institute of Human Relations. He is a founder member of the International Society for the Psychoanalytic Study of Organisations, an associate member of the Bayswater Institute and is particularly involved in action-research and consultancy in Europe and Latin America in the fields of industry, health, education, music and sport.