U.S. Army Research Office (07/2002-12/2014) Basic Research Program Manager (retired 01/2015) University of Alabama in Huntsville (09/1974-07/2002) Professor Emeritus of Mathematical Sciences (09/2002-present) Chair of Mathematical Sciences Department (09/01/1993- 08/31/2001) Professor of Mathematical Sciences (09/1985 - 07/2002) Associate Professor of Mathematical Sciences (09/1978- 08/1985) Assistant Professor of Mathematical Sciences (09/1974 - 08/1978) North Carolina State University (06/2008-present) Adjunct Professor of Mathematics Massachusetts Institute of Technology (09/1984-02/1985) Visiting Scientist at MIT Laboratory for Information and Decision Systems (LIDS)