Lawrence J. Cohen, Ph.D., is a clinical psychologist specializing in children’s play, play therapy, and parenting. He is the author of Playful Parenting and co-author, with Michael Thompson, Ph.D., and Catherine O’Neill Grace, of Best Friends, Worst Enemies and Mom, They’re Teasing Me. Dr. Cohen leads Playful Parenting workshops for parents, teachers, and child-care professionals. He lives in Boston, Massachusetts, with his wife, Liz. They have two grown children.