Donald G. Dutton is a professor in the Department of Psychology at the University of British Columbia. He has served as an expert witness in domestic violence cases and worked with the police to develop a teaching program for them. He has also provided group therapy for wife assaulters and has worked with battered wives.Harry L. Rinker is a leading national expert and co nsultant on toys, antiques, and collectibles and the author of numerous books on collecting. He writes a weekly news column, hosts a radio call-in show, and has appeared as an expert on several national television shows. Rinker's personal collection of over 50,000 objects contains approximately 7,000 toys.