Andy Isaacs taught fourth and fifth grades in Chicago-area public schools from 1977 to 1985. In 1985, he joined the Department of Mathematics, Statistics, and Computer Science at the University of Illinois at Chicago as a lecturer in mathematics education. Beginning in 1986, Isaacs worked on the Teaching Integrated Mathematics and Science Project (TIMS) at UIC and later worked on UIC’s Maneuvers with Mathematics Project. From 1990 to 1995, he was a full time writer for Math Trailblazers, a comprehensive curriculum for grades K-5 based on TIMS and funded by the National Science Foundation. More recently, he has led all revisions to Everyday Mathematics, including the California and Texas editions in 2008, the Common Core State Standards edition in 2012, and Everyday Mathematics 4, published in 2015. He is director of the university’s Center for Elementary Mathematics and Science Education and a senior research associate in the physical sciences division. Isaacs received a bachelor’s degree in classical Greek from Northwestern University, a master’s in elementary education from the University of Chicago, and a doctorate in mathematics from the University of Illinois at Chicago.