Lin Gu is a senior research scientist with the Center for Language Education and Assessment Research in the Research & Development division at ETS. She has broad training in the areas of language pedagogy, language testing, and educational measurement. She received a Ph.D. in second language acquisition from the University of Iowa. Since joining ETS, Gu has focused her research on validity issues in assessing English language learners, technology-enhanced language assessments, and the use of artificial intelligence (AI) in learning and assessment contexts. Working with cross-functional teams, Gu has developed AI-augmented educational solutions that are well grounded in language learning principles and measurement theories.