Editor-in-Chief for the following Journals

• Abstract and Applied Analysis (since Oct 2006)

• Advances in Dynamical Systems and Applications (since Oct 2005)

• International Journal of Difference Equations (since Oct 2005)

• Difference Equations and Discrete Dynamical Systems - An Electronic Newsletter (since Feb 2005)

Associate Editor for the following Journals

• Advances in Theoretical and Applied Mathematics (since Nov 2005)

• Advances in Difference Equations (since Jul 2003)

• Archive of Inequalities and Applications (since Jul 2003)

• Communications in Mathematical Analysis (old site) (since Aug 2005)

• Global Journal of Pure and Applied Mathematics (since May 2005)

• International Journal of Dynamical Systems and Differential Equations (since May 2006)

• International Journal of Mathematics and Mathematical Sciences (since Apr 2006)

• International Journal of Applied Mathematics and Statistics (since Jan 2008)

• International Journal of Mathematics and Statistics (since Jun 2007)

• International Journal of Modern Mathematics (since Jan 2006)

• International Journal of Nonlinear Operators Theory and Applications (since Oct 2005)

• Involve - A Journal of Mathematics (since Jan 2008)

• Journal of Inequalities and Applications (since Jul 2003)

• Nonlinear Dynamics and Systems Theory (since Nov 2006)

• Selcuk Journal of Applied Mathematics (since Feb 2004)

Guest Editor for the following Journals

• Computers and Mathematics with Applications

• Dynamic Systems and Applications

• Journal of Computational and Applied Mathematics

• Journal of Difference Equations and Applications

Reviewer for the following Journals

• Advances in Difference Equations

• African Diaspora Journal of Mathematics

• Annali di Matematica

• ANZIAM Journal

• Applicable Analysis and Discrete Mathematics

• Applied Mathematical Modelling

• Applied Mathematics and Computation

• Applied Mathematics Letters

• Archiv der Mathematik

• Archive of Inequalities and Applications

• Australian Journal of Mathematical Analysis and Applications

• Bulletin of the Institute of Mathematics, Academia Sinica New Series

• Bulletin of the Malaysian Mathematical Sciences Society

• Canadian Applied Mathematics Quarterly

• Communications in Mathematical Analysis

• Communications in Nonlinear Science and Numerical Simulation

• Computers and Mathematics with Applications

• Constructive Approximation

• CUBO Matematica Educacional

• Differential Equations and Dynamical Systems

• Discrete and Continuous Dynamical Systems

• Discrete and Continuous Dynamical Systems, Series B

• Discrete Dynamics in Nature and Society

• Dynamic Systems and Applications

• Dynamics of Continuous, Discrete and Impulsive Systems

• Electronic Journal of Differential Equations

• Electronic Journal of Qualitative Theory of Differential Equations

• Electronic Transactions on Numerical Analysis

• Glasnik Matematicki

• IEEE Transactions of Automatic Control

• IEEE Transactions of Neural Networks

• IEEE Transactions of Systems, Man and Cybernetics - Part B

• IMA Journal of Applied Mathematics

• Indian Journal of Pure and Applied Mathematics

• International Journal of Applied Mathematical Sciences

• International Journal of Computer Mathematics

• International Journal of Evolution Equations

• International Journal of Numerical Methods for Heat and Fluid Flow

• International Journal of Mathematics and Mathematical Sciences

• Inverse Problems

• Iranian Journal of Science and Technology

• Journal of Applied Mathematics and Computing

• Journal of Approximation Theory

• Journal of Computational and Applied Mathematics

• Journal of Difference Equations and Applications

• Journal of Geometry

• Journal of Inequalities in Pure and Applied Mathematics

• Journal of Mathematical Analysis and Applications

• Journal of Mathematical Sciences

• Journal of Optimization Theory and Applications

• Journal of Physics A: Mathematical and Theoretical

• Journal of the Korean Mathematical Society

• Journal of the London Mathematical Society

• Journal of Mathematical Inequalities

• Linear Algebra and its Applications

• Mathematical and Computer Modelling

• Mathematical Inequalities & Applications

• Mathematische Nachrichten

• Missouri Journal of Mathematical Sciences

• Nonlinear Analysis

• Nonlinear Analysis: Real World Applications

• Nonlinear Dynamics

• Proceedings of the American Mathematical Society

• Proceedings of the Royal Society of Edinburgh

• Proceedings Mathematical Sciences

• Publicationes Mathematicae Debrecen

• Rocky Mountain Journal of Mathematics

• SIAM Journal on Control and Optimization

• Soochow Journal of Mathematics

• Taiwanese Journal of Mathematics

• Turkish Journal of Mathematics

• ZAA

• ZAMM

Reviewer for the following Book Publishers

• Brooks/Cole

• Harcourt Academic Press

• Houghton Mifflin

• John Wiley & Sons

• Springer

Reviewer for the following Agencies:

• Grant Agency of the Academy of Sciences of the Czech Republic

• Engineering and Physical Science Research Council

• Mathematical Reviews

• National Science Foundation

• University of Missouri Research Board

Reviewer for numerous conference proceedings