Andreas Blass is a professor of mathematics at the University of Michigan. He received his PhD from Harvard University in 1970 and has been at the University of Michigan ever since, except for brief leaves. He has also been a visiting researcher at Microsoft Research during one of those leaves and during each of the last 13 summers. His primary research area is set theory, but he has also worked in other branches of logic, in theoretical computer science, and in finite combinatorics. He is a fellow of the American Mathematical Society.