Linda Acredolo,Ph.D., ProfessorEmeritus ofPsychology at theUniversity ofCalifornia atDavis, is aninternationally recognized scholar inthe field of child development. She isa Fellow of both the AmericanPsychological Association and the American PsychologicalSociety and has served as an associate editor of the prestigiousjournal,Child Development. She is also a member oftheParentsmagazine advisory board.Susan Goodwyn, Ph.D., Professor Emeritus ofPsychology at the California StateUniversity at Stanislaus, has servedas a project director and co-principleinvestigator for severallongitudinal research projectsfunded by the National Institutes ofHealth and the Kellogg Foundation.She currently… serves as president ofBaby Signs, Inc., an infant and toddler educational productscompany.