### About The Author

#### Andrew M. Gleason

**Dr. Andrew Mattei Gleason** (1921–2008) was a mathematician who made many contributions to widely varied areas of math, including the solution of Hilbert's 5th problem and was a leader in innovation and reform in mathematics teaching at all levels. Professor Gleason's theorem in quantum logic and the Greenwood–Gleason graph, an important example in Ramsey's theory, is named after him.

As a young naval officer in World War II, Andrew broke Japanese and German military codes. After the war, he spent his entire academic career at Harvard University, from which he retired in 1992. His numerous academic and scholarly leadership posts included chairmanship of the Harvard Mathematics Department and the Harvard Society of Fellows and the presidency of the American Mathematical Society. He continued to advise the United States government on cryptographic security, and the Commonwealth of Massachusetts on mathematics education for children, almost until the end of his life.

#### Deborah Hughes-Hallett

**Dr. Deborah J. Hughes Hallett** is a mathematician who works as a professor of mathematics at the University of Arizona. She has taught as the Professor of the Practice in the Teaching of Mathematics at Harvard University and continues to hold an affiliation with Harvard as Adjunct Professor of Public Policy in the John F. Kennedy School of Government. Her expertise is in the undergraduate teaching of mathematics.

Professor Hughes Hallett earned a bachelor's degree in math from the University of Cambridge in 1966, and a master's from Harvard in 1976. She worked as a preceptor and senior preceptor at Harvard from 1975 to 1991, as an instructor at the Middle East Technical University in Ankara, Turkey from 1981 to 1984, and as a faculty member at Harvard from 1986 to 1998. She served as Professor of the Practice in the Teaching of Mathematics at Harvard from 1991 to 1998. She moved to Arizona in 1998 and took on her adjunct position at the Kennedy School in 2001.

#### Eric Connally

#### William G. McCallum

**Dr. William G. McCallum** is a University Distinguished Professor of Mathematics and was Head of the Department of Mathematics at the University of Arizona from 2009 to 2013. He earned his Ph.D. in Maths from Harvard University in 1984. He has numerous awards under his belt.

His research interests include: Mathematics Education Research, Number Theory, Teacher Preparation, and Outreach, Undergraduate Education

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