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Joseph Assof is an 11th and 12th grade mathematics teacher and the math department chair at Health Sciences High and Middle College in San Diego, CA. He leads his department’s reform efforts to align to the Common Core Standards – with a focus on high quality instruction. He is a member of the San Diego County Math Leaders Task Force, whose mission is to support every student in meeting the rigorous expectations of the Common Core. Joseph’s classroom is featured in a number of Visible Learning for Mathematics, Grades K-12 videos.