After Hyman Bass received his doctorate in mathematics from the University of Chicago in 1959, he did mathematics research at Columbia University until arriving at the University of Michigan in 1999 with a joint appointment in the mathematics department and the School of Education. His work in education has been largely in collaboration with Deborah Loewenberg Ball and her research groups. A continuing focus of that work has been a practice-based theory of mathematical knowledge for teaching and its applications to teacher education, development, and evaluation. In all of this work, he tries to address problems of inequitable access in STEM education, which entails the design of curricula and instruction that reconcile high aspirations with well-supported access and give ample attention to collective intellectual effort. Bass is a member of the American Academy of Arts & Sciences, the National Academy of Sciences, the National Academy of Education, and the Third World Academy of Science. In 2012 he received the U.S. National Medal of Science for his work in both mathematics and education.