Dr. Tzur is a professor of mathematics education at the University of Colorado Denver’s School of Education and Human Development. He completed a PhD degree at the University of Georgia (Athens). His research focuses on children’s construction of early number and fractional knowledge, on mathematics teachers’ professional development, and on linking mathematical thinking/learning with brain processes. He currently serves as a Principal Investigator on the 4-year, $3,000,000 NSF-funded project, “Student-Adaptive Pedagogy for Elementary Teachers: Promoting Multiplicative and Fractional Reasoning to Improve Students’ Preparedness for Middle School Mathematics.” This project implements and studies a professional development (PD) intervention designed to shift upper elementary teachers’ mathematics teaching toward a constructivist approach, called student-adaptive pedagogy (AdPed), which adapts teaching goals and activities based on students’ conceptions and experiences – and measure the impact of that shift on students’ learning and outcomes. Initial findings indicated statistically significant growth in teachers, and corresponding growth in students’ ability to reason in multiplicative situations (including place value, base ten tasks).