We are deeply saddened to share with the community the news of the passing of David Rush, Professor Emeritus of Mathematics at UC Riverside (UCR).

“We learned that Professor Emeritus Dave Rush passed away on February 13, 2023. He joined UCR in 1971 and retired in 2018 after almost 50 years. Dave Rush was a dedicated teacher and researcher. He organized the long-running Friday Algebra Seminar at UCR (from 1983 to 2018!). He authored 83 papers, many with his students and the VAPs who came to work with him. His work spans a wide variety of topics in Commutative Algebra, from flat modules to problems on bounding number of generators of ideals, from Bezout domains to study of associated primes of ideals, from lattice modules to Rees algebras. At least a third of his work was with Professor Emeritus Jack Ratliff. Together they made many advances in ideal theory for commutative rings. In fact, a closure operation on ideals was named in their honor, and nowadays the Ratliff-Rush closure of an ideal is an object of interest to many who work in commutative algebra. Prof. Rush supervised 13 Ph.D. students and worked with many visiting assistant professors at UCR, who benefited immensely from his kind nature, his mathematical wisdom, and his support. ” – C. Ciuperca, B. Engheta, I. Henriques, Y. Kim, K. Lin, P. Mantero, J. McCullough, K. Shah, J. Hong, J. Vassilev, and all Dr. Rush’s VAPs