Paola Sztajn is a Professor of Mathematics Education at North Carolina State University and is a Principal Investigator in Project AIM (All Included in Mathematics). Her research program focuses on elementary teachers’ professional development in mathematics and has been supported with several grants from different funding agencies. She has written over 90 papers, mostly focused on elementary school mathematics teachers and teaching. The overarching question guiding her over 20 years of work in mathematics education is: in which ways do practicing elementary teachers acquire and continue to develop the professional knowledge and identity needed to teach all students high quality mathematics? She works with colleagues from different fields, in collaborative studies that allow for in-depth investigations of this complex question.