Professor Steven M. Zelditch of Northwestern University passed away on September 11, 2022, two days short of his 69th birthday. He was a Ritt Assistant Professor at Columbia University from 1981 to 1985 where, among many important works, he laid down the foundations for a geometric theory of quantum chaos. He was well-loved and respected by all those who knew him, and his memory will live on in the Columbia Mathematics department.

https://sites.math.northwestern.edu/steve_zelditch/

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