Hector Rosario Director of Festivals Hector Rosario is an award-winning teacher with a Ph.D. in mathematics education from Columbia University. His advisor, the legendary Bruce Vogeli, referred to him as “a real game changer” who was “one of the brightest students [he] had during [his] half century at Columbia University.” Hector has over two decades of teaching experience, including multiple K–12 settings, three prisons in North Carolina, and 12 years at the University of Puerto Rico (Mayagüez). He also co-founded the Chapel Hill Math Circle and founded the Triangle Math Teachers’ Circle in North Carolina. Hector is the principal editor of the 17-country anthology Mathematics and Its Teaching in the Southern Americas (2015) and the co-author of Math Makes Sense! A Constructivist Approach to the Teaching and Learning of Mathematics (2016). His third book, Mathematical Outreach: Explorations in Social Justice around the Globe, will be published in 2019.