Sergey Fomin, the Robert M. Thrall Collegiate Professor of Mathematics, will receive the 2018 Steele Prize for Seminal Contribution to Research in Discrete Mathematics/Logic. The prize recognizes his paper with Andrei Zelevinsky (posthumously)  "Cluster algebras I: Foundations,"  published in 2002 in the Journal of the American Mathematical Society. Presented annually by the American Mathematical Society, the Steele Prize for Seminal Contribution to Research is awarded for a paper that has proved to be of fundamental or lasting importance in its field, or a model of important research. The prize will be awarded at the Joint Mathematics Meetings in San Diego in January.