Donna Jackson-Maldonado, Ph.D., is Professor at Department of Languages and Literature (Facultad de Lenguas y Letras) in Universidad Autonoma de Queretaro, Qa de Cedros, Mexico. Dr. Jackson-Maldonado was born in the United States but was brought up in Mexico. She has lived in a bilingual-bicultural environment all of her life. Her initial professional experience was as a speech-language pathologist working with children with language disorders and learning disabilities and deaf children. She also has worked for the Mexican government's special education and communication disorders programs, doing in-service training, writing books and manuals, and developing language assessment instruments. Dr. Jackson-Maldonado received her doctorate in linguistics from El Colegio de Mexico in Mexico City. Her research has been in Spanish and bilingual language development in infants and toddlers. Part of this work was the development of the Mac-Arthur Inventarios del Desarrollo de Habilidades Comunicativas and, with Donna J. Thal, a language and gesture battery for Spanish speakers. Dr. Jackson-Maldonado is currently a full-time professor and researcher at the Universidad Autonoma de Queretaro in Mexico. She directs a project on late-talking Spanish-speaking toddlers. Dr. Bates was a founding member of the Cognitive Science Department at University of California at San Diego (the first of its kind in the world), the Director of the federally-funded UCSD Project in Cognitive and Neural Development, a founding co-director of the innovative Joint Doctoral Program in Language and Communicative Disorders at San Diego State University and UCSD, and the Director of the Center for Research in Language and Professor of Cognitive Science at UCSD. With strengths in developmental psychology, linguistics, neurology, and cognitive science, she carried out many creative and influential collaborative studies on the interrelations among language acquisition, brain function, symbolic growth, and other key aspects of development. During her extensive career, she directed cross-linguistic studies on 4 continents and authored or co-authored 10 books and more than 200 scientific publications. Her work was interdisciplinary, influencing diverse fields such as neuroscience, linguistics, biology, psychology, computer science, and medicine. Donna J. Thal, Ph.D., holds a master of science degree in speech pathology and audiology from Brooklyn College and a doctorate in speech and hearing sciences from the Graduate School and University Center of the City University of New York (CUNY). She has been a postdoctoral fellow at the Center for Research in Language at UCSD, an assistant professor at Hofstra University, and an assistant professor at Queens College of CUNY. Dr. Thal is a developmental psycholinguist and a certified and licensed speech-language pathologist who has conducted research in a number of areas, including normal and disordered development of language and cognition, children with focal brain injury, and children with delayed onset of language. She has also carried out studies of language development in Spanish-speaking infants and toddlers. Her most recent work focuses on early identification of risk for clinically significant language impairment and is funded by a grant from the National Institute of Deafness and Other Communicative Disorders (NIDCD), within the National Institutes of Health. Dr. Thal is an editorial consultant for language for the Journal of Speech, Language, and Hearing Research and the American Journal of Speech-Language Pathology. She was the California State nominee for the American Speech-Language-Hearing Foundation Outstanding Clinical Achievement Award in 1996, received the Monty Distinguished Faculty Award from SDSU 1998 and the Albert W. Johnson Research Lecturer Award from SDSU in 1999, and was the Wang Family Excellence Award nominee from SDSU in 2000. She served a 4-year term on the Communicative Disorders Review Committee for the NIDCD from 1998 to 2002. Dr. Thal is a co-author of the MacArthur Communicative Development Inventories."