Linda AcredoloDrs. Linda Acredolo and Susan Goodwyn discovered Baby Signs in 1982 and conducted the pioneering scientific research for the National Institute of Health that demonstrated the language and cognitive benefits of Baby Signing. Linda is Professor of Psyhology at the University of CA, Davis. Susan is Professor of Psychology and Child Development at the California State University. They are the authors of Baby Signs published by Contemporary Books. Both authors live and work in Northern California. Read More Read Less