Eisenstat, who joined the Yale faculty in 1971, also served as an associate editor of the
Journal of the ACM and served as a member of the editorial board of the
SIAM Journal on Matrix Analysis and Applications. His major research interests included numerical linear and nonlinear algebra, direct and iterative methods for solving sparse linear systems, and parallel computing.
"Stan held us all to a very high standard, whether through naming inconvenient truths in faculty meetings, or through his commitment to excellence in the classroom,” said Jeffrey Brock, Dean of the School of Engineering & Applied Science. “He was an unmatched steward of Yale's deepest values. We have lost an inspiring intellect, an unparalleled university citizen, and a dear friend.”