For more information, please email Hector Rosario (hr111 (at) caa (dot) columbia (dot) edu) or Linda Green (linda.green (at) unc (dot) edu). You may also contact us at chapelhillmathcircle@gmail.com.

## About the Directors

**Hector Rosario** holds a Ph.D. in mathematics education from Columbia University and was a tenured professor of mathematics at the University of Puerto Rico at Mayagüez (2003-2015). He joined the faculty of the North Carolina School of Science and Mathematics (NCSSM) in August of 2015 and left in June of 2016. While at NCSSM, Hector created a problem-solving YouTube series and Math 1 Resources for Teachers. He is the co-author of *Math Makes Sense! A Constructivist Approach to the Teaching and Learning of Mathematics* (2016) and the principal editor of the 17-country anthology *Mathematics and Its Teaching in the Southern Americas.*

**Linda Green** has been a Lecturer in the Math Department at the University of North Carolina at Chapel Hill since Fall 2013. Before moving back home to North Carolina, she taught at Dominican University of California and directed the Marin Math Circle. She holds a Ph.D. in mathematics from Princeton University in the field of topology and geometry.