Gabriel Rosenberg has been teaching mathematics at Bard High School Early College in Manhattan since 2004 and writing curriculum for Illustrative Mathematics since 2018. His past experience as a research mathematician focused on group theory leads him to believe the classroom should be a place where students play with the mathematics. He is an alumnus of the Park City Mathematics Institute (2011-2017) as both a participant and staff, a proud MƒA Master Teacher since 2007, and an avid curler.