David Campbell is a well-established clinical psychologist, who works as a trainer and clinician for the National Health Service at the Tavistock Clinic in London, and also as a freelance consultant to teams and small organizations. For many years he has been interested in developing techniques for working with organizations that incorporate the principles of systemic thinking. His work has led to consulting and training projects throughout the U.K. and Europe for both public and private sector institutions. He has written several articles and books on this subject and is a co-editor of the Systemic Thinking and Practice Series, containing thirty-nine books, which has promoted many new ideas in this field.
Marianne Groenbeck is an organizational consultant with a background in family therapy and management. Since 1997, she has been the manager of MG-UDVIKLING, a successful consulting firm offering consultation, supervision, and education to managers and employees in private and public organizations in Denmark and Scandinavia. She is a practice-centered consultant, and her particular interest is in working with organizations to create models of organization and communication that lead to better practice. Her work is inspired by systemic thinking, appreciative practice, positioning theory, and semantic polarities.