Served as a referee for the following journals:

American Mathematical Monthly, Integral Equations and Operator Theory, Proceedings of the American Mathematical Society, Michigan Mathematical Journal, Illinois Journal of Mathematics, Indiana University Mathematics Journal, Israel Journal of Mathematics, Journal of Functional Analysis, Houston Journal of Mathematics, Bulletin of the Iranian Mathematical Society, Monatshefte fur Mathematik, Journal of Operator Theory, Contemporary Mathematics, Arkiv för Mathematik, Forum D'Analystes, Acta Scientiarum Mathematicarum, Transactions of the American Mathematical Society, Journal of Mathematical Analysis and Applications, Abstract and Applied Analysis, Proceedings of the Edinburgh Mathematical Society, Bulletin of the Canadian Mathematical Society, Bulletin of the Korean Mathematical Society, London Mathematical Society Journals, Arkiv der Mathematik, Rendiconti del Circolo Matematico di Palermo, Taiwanese Journal of Mathematics, Linear Algebra and Its Applications, Mathematische Zeitschrift, Complex Variables, Proceedings of the Royal Irish Academy, Physics Letters A, Rocky Mountain Journal of Mathematics, Advances in Mathematics

Served as a reviewer for Mathematical Reviews

Served as a reviewer for the National Science Foundation of the USA

Served as President of Washington and Lee University’s chapter of Phi Beta Kappa, 2000--2002.