## About the Authors: Illustrative Mathematics

Illustrative Mathematics is a nonprofit founded by mathematician and standards author Bill McCallum, University Distinguished Professor of Mathematics at the University of Arizona. Bill has worked both in mathematics research—in the area of number theory and arithmetical algebraic geometry—and in math education, advising materials developers and policymakers. In 2009–10, Bill was one of the three lead authors of the Common Core State Standards in Mathematics.

Since 2011, Illustrative Mathematics has created openly licensed materials to support the K–12 community. Their high-quality instructional and assessment tasks, lesson plans, and other resources for teachers, assessment writers, and curriculum developers inspire a deeply loyal following; today, Illustrative Mathematics is the premier source of freely available online mathematics content for teachers, teacher leaders, assessment developers, curriculum writers, and teacher educators.

Illustrative Mathematics also provides professional learning that supports meaningful shifts in mathematical practice.

In 2014, Illustrative Mathematics was selected to author a middle school math curriculum in response to a call for developers of high-quality, standards-aligned curriculum by the 13-state K–12 OER Collaborative, now named Open Up Resources.

The team developing the middle school math curriculum includes K–12 teachers, mathematicians, and education researchers. This experienced authoring team has enjoyed a fruitful collaboration with the 175 classroom teachers participating in the six-district beta of the Open Up Resources Middle School Math Curriculum. Bill McCallum observed, “While I and my colleagues bring mathematical and standards expertise to this work, the teachers on our writing and beta teams are experts on how to engage students in our materials. Their input is the key to success in our curriculum development process.”

You can learn more about Illustrative Mathematics on their website.