ผู้เขียน: Martin R. Sheehan

Geoff Colvin draws on his experience as a classroom teacher, administrator, researcher and instructor at the University of Oregon, and national public school consultant. Widely recognized as an expert on the subjects of school safety and violence prevention, Colvin has provided inservice training for teachers and administrators in more than 100 school districts and agencies nationally and internationally. He recently served as research associate at the University of Oregon and independent consultant in the areas of schoolwide discipline, school climate, school safety, and violence prevention, classroom management, and individual cases involving students with severe behavior disorders. Geoff also directed a juvenile detention school and a school program for youth with serious emotionally disturbances. Colvin has authored more than sixty publications, books, book chapters, journal articles, and video programs on the subject of teaching and managing students who exhibit the full range of problem behavior.