About the AuthorThomas W. Phelan, PhD, is a clinical psychologist and a nationally renowned expert on child discipline and attention deficit disorder. He is the author of several books, including 1-2-3 Magic, 1-2-3 Magic for Teachers, All About Attention Deficit Disorder, Surviving Your Adolescents, and Tantrums! He lives in Glen Ellyn, Illinois. what is in a book talk Room Wreckers: Who's in Charge at Your House? (Quick Reference Guides)