Gladys is the 2024-2025 Provost’s Distinguished Associate Professor of Mathematics education at William & Mary. Her research centers on teacher knowledge and children’s mathematical thinking and how these two areas interact in classroom settings that involve multilingual and multicultural dynamics. Through her National Science Foundation (NSF) funded projects she has worked to conceptualize teacher knowledge of children’s mathematical thinking, situated in the practice of anticipating student strategies for fraction problems, and examined how teachers select numbers for problems to support fraction understanding. She has continued to expand on this work, extending it to work with bilingual parents and communities that supports the development of more equitable mathematics pedagogy. Gladys has also participated in the development of teacher and student assessments that involve articulating the knowledge to be assessed, identifying the kinds of evidence that demonstrate this knowledge, developing and refining potential items to elicit this evidence, and assembling the items into a complete assessment. She also has experience using large data sets to conduct computational and statistical analysis of teacher retention and has extensive experience teaching mathematics methods to bilingual pre-service teachers.