George Roger Sell

George Roger Sell (February 7, 1937 – May 29, 2015) was an American mathematician, specializing in differential equations, dynamical systems, and applications to fluid dynamics, climate modeling, control systems, and other subjects.
Biography.
Sell was born in Milwaukee, Wisconsin. He received in 1957 his bachelor's degree and in 1958 his M.Sc. from Marquette University and in 1962 his Ph.D. from the University of Michigan with thesis under the direction of Wilfred Kaplan and Lamberto Cesari. The mathematics department there awarded him the Sumner B. Myers Prize for the year's best doctoral dissertation submitted to the department. As a graduate student, Sell held a recurring summer job at the AC Spark Plug Division of AC Delco, working on the guidance system for Titan rockets. He was a Benjamin Peirce instructor from 1962 to 1964 at Harvard University. He was from 1964 to 1968 an assistant professor, from 1968 to 1973 an associate, and from 1973 until retirement a full professor at the University of Minnesota. From 1982 to 1987 Sell was the associate director of the Institute for Mathematics and its Applications. From 1984 to 1994 he the director of the Army High Performance Computing Research Center at the University of Minnesota campus. He was a visiting professor on sabbatical at various institutions, including the University of Southern California and the University of Florence, where he worked with Roberto Conti. Sell was the author or coauthor of more than 120 publication in refereed journals.
In 1983 he was an Invited Speaker at the ICM in Warsaw. In 1988 he was the founding editor-in-chief of the "Journal of Dynamics and Differential Equations". In 1990 Leningrad State University awarded him an honorary doctorate, who was the fifth foreigner given that particular distinction. In July 2002 Spain's University of Valladolid sponsored a conference in his honor at Medina del Campo. In 2012 he was elected a Fellow of the American Mathematical Society.
Upon his death he was survived by his wife, six children, and several grandchildren.