Doc. Mehdi Toloo, B.Sc. (Pure Mathematics), M.Sc. (Applied Mathematics), Ph.D. (Operations Research), academic staff in the Department of Systems Engineering and Informatics, Technical University of Ostrava, Czech Republic. Areas of interest include Data Envelopment Analysis, Multi-objective programming and Network Flows. He has written fourteen books. His research has been published in OMEGA, Energy, European Journal of Operational Research, Computers & Operations Research, International Journal of Production Research, Journal of the Operational Research Society, Annals of Operations Research, Computers & Industrial Engineering, Applied Mathematics and Computers, Applied Mathematical Modelling, Expert Systems with Applications, 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, Mathematical Methods of Operations Research, and RAIRO - Operations Research.