Mehdi Toloo, B.Sc. (Pure Mathematics), M.Sc. (Applied Mathematics), Ph.D. (Operations Research), Associate professor at Department of Business Administration, Technical University of Ostrava, Czech Republic. Areas of interest include Data Envelopment Analysis, Multi-objective programming and Network Flows. He has written fifteen books. His research has been published in European Journal of Operational Research, Computers & Operations Research, International Journal of Production Research, Computers & Industrial Engineering, Applied Mathematics and Computers, Applied Mathematical Modelling, Expert Systems with Applications, Annals of Operations Research, Journal of the Operational Research Society, International Journal of Advanced Manufacturing Technology, Computers and Mathematics with Applications, Measurement, Computational Economics, Computational and Applied Mathematics, IMA Journal of Management Mathematics, International Journal of Management Science, The Journal of Supercomuting, and Mathematical Methods of Operations Research.