Professor Emeritus Joseph Kohn passed away Tuesday, September 13. He was 91 years old.

After receiving his B.S. degree from MIT, Kohn came to Princeton as a graduate student, where he was a student of Donald Spencer, and received his Ph.D. in 1956.

After serving as an instructor at Princeton for a year, then as a member of the Institute for Advanced Study from 1957 to 1958, he joined the faculty at Brandeis University, where he became professor of mathematics and served as chair of the mathematics department from 1963 to 1966. He returned to Princeton as a professor of mathematics in 1968, where he remained until retiring in 2008

Joe worked influentially in the area of mathematical analysis, and mentored many successful mathematicians. He was a member of the American Academy of Arts and Sciences, and the National Academy of Science. In 1979, Joe was awarded the Steele Prize by the American Mathematical Society, and in 2004 he received the Bolzano Medal from the Czechoslovak Mathematics and Physics Society. He was a valuable member of the mathematics community, and will be greatly missed.