A math teacher for more than two decades, he creates math videos for Eureka Math. He also releases his math videos through his self-titled YouTube channel.
He began teaching math in 1989. He would later create his YouTube channel in 2006 and begin posting math videos in 2009.
He has taught for the public school system, specifically the Pleasanton Unified School District.
He is a native of Pleasanton, California.
Both he and ShadowMarioXLI have worked as math teachers.