Dr. Marchman earned her doctoral degree in Developmental Psychology from the University of California, Berkeley, and was a postdoctoral fellow at the University of California, San Diego. She served on the faculty at the University of Wisconsin–Madison and the University of Texas at Dallas and was named Distinguished Scholar at the Callier Center for Communication Disorders. She is currently a research scientist in the Department of Psychology at Stanford University and the Department of Developmental-Behavioral Pediatrics at Stanford University School of Medicine. Dr. Marchman has conducted research in several areas of language and cognitive development, language disorders, and early childhood development. Her most recent work focuses on individual differences in language-processing efficiency and vocabulary development in monolingual English and bilingual (Spanish/English) children born full term and preterm. Dr. Marchman is a member of the MacArthur-Bates CDI Advisory Board, the developer of the CDI Scoring Program, and a contributor to Web-CDI, the CDI-CAT, and Wordbank.

Philip S. Dale, Ph.D., is Professor in Departments of Psychology, Linguistics, and Speech and Hearing Sciences at University of Washington. Dr. Dale's research interests include assessment of young children's language, language development in exceptional populations including linguistically precocious children, early language and cognition, and the effects of various models of intervention for young children with disabilities.