B.S. (1959) Memphis State University
M.S. (1962) University of California at Los Angeles
Ph.D. (1963) University of California at Los Angeles
Summer 1963 Instructor in Mathematics, Tulane University
1963-64 National Science Foundation Postdoctoral Fellow, University of Washington
Summer 1964 Assistant Professor of Mathematics, University of California at Los Angeles
1964-1965 Assistant Professor of Mathematics, University of Florida
1965-1972 Assistant, Associate, and Full Professor of Mathematics, Carnegie Mellon University (tenure awarded with associate professorship)
1967-1969 Visiting Professor of Mathematics, Indian Institute of Technology, Kanpur
Spring 1969 Sussman Professor of Mathematics, Technion: the Israel Institute of Technology, Haifa
Summer 1969 Visiting Member, Mathematische Centrum, Amsterdam
1972-1984 Professor of Mathematics and Chairman, Department of Mathematical Sciences, The University of Memphis
1984-present, Professor of Mathematical Sciences, Department of Mathematical Sciences, The University of Memphis
1985-present Co-director, Institute for Intelligent Systems, The University of Memphis
2000-2003 Dunavant Professor of Computer Science, The University of Memphis
2004-present W. Harry Feinstone Interdisciplinary Professor, The University of Memphis
Dunavant Professorship