Peter De Jong Peter De Jong, Ph.D., is a professor of social work at Calvin College in Grand Rapids, Michigan. He has been an outpatient therapist, case worker, and led trainings and consultations with mental health clinics, family service agencies, juvenile corretions programs, and schools. In addition to co-authoring (with Insoo Kim Berg) two earlier editions of INTERVIEWING FOR SOLUTIONS, he has written several articles and book chapters on solution-focused therapy. Peter continues to develop new practice tools and therapy and training manuals, and to conduct research on practice and how new practitioners acquire a solution-focused outlook and skills. Read More Read Less