Employment

(2024-Present) Editor, zbMATH Open (Zentralblatt MATH)
(2019-Present) Mathematical Scientist and Educator, Ann Arbor, MI.
(2013-2020, 2021-2023) Sponsored Affiliate, Department of Mathematics, University of Michigan.
(2020-2021) Visiting Scholar, Department of Mathematics, University of Michigan.
(2013-2019) Associate Editor, Mathematical Reviews, American Mathematical Society. and Sponsored affiliate, Department of Mathematics, University of Michigan.
(2000-2012) Full, Associate and Assistant Professor, Department of Mathematics, Georgia Southern University.
(2007-2013) Founder and Director of the Unit for Advances in Mathematics (IUAM). (IUAM is an interdisciplinary university institute with home the College of Science and Mathematics).
(2005-2006) New Directions Research Professor, Institute of Mathematics and its Applications (IMA), University of Minnesota. [on leave].
(2008-2011) Visiting Full Professor, School of Computational and Applied Mathematics, University of the Witwatersrand. [Joint appointment with GSU].
(Fall 2007) Visiting Professor, Department of Mathematics, University of the Witwatersrand. [On leave].
(1999-2000) Visiting Professor, Department of Mathematics, Pennsylvania State University [On leave].
(1998-2000) Research Associate of the John Knopmacher Centre for Applicable Analysis and Number Theory and Lecturer, Department of Mathematics, the University of the Witwatersrand.
(1996-1997) Postdoc, Department of Mathematics, University of South Florida and Visitor, Katholieke Universiteit, Leuven.