Margaret Heritage is senior scientist at WestEd and assistant director at the National Center for Research on Evaluation, Standards, and Student Testing at the University of California, Los Angeles. For many years her work has focused on formative assessment and on how teachers can implement effective formative assessment in their classrooms. She has made numerous presentations all over the United States, as well as in Europe, Asia, and Australia, and has published extensively on the topic. Her last book, Formative Assessment in Practice: A Process of Inquiry and Action, was also published by Harvard Education Press.

Aída Walqui directs the Teacher Professional Development Program at WestEd. She specializes in the professional growth required by teachers to work with second-language learners deeply and generatively. Her work has focused on defining, designing, and supporting quality education in multilingual, intercultural contexts in the United States, Europe, Asia, and Latin America. She has published extensively on issues related to teacher professional development and the development of deep literacies with English language learners.

Robert Linquanti is project director and senior researcher at WestEd. His work helps educators and policy makers at local, state, and national levels to strengthen assessment, evaluation, and accountability policies, practices, and systems for English language learners. He has published and presented widely on evaluating education policies, establishing comprehensive assessment systems, and improving accountability and equity for ELLs. He serves on several state and national advisory bodies related to these topics.