Mahmoud Hesaaraki received his Ph.D. from University of Michigan in 1982. He has been a faculty member of Sharif niversity of Technology since 1970 and has served the university as a teacher, researcher, and in several administrative positions such as the vice-chancellor of the university and the chairman of the department. For the past few years his interested research area has been mostly related to Mathematical Biology, especially in Predator-Prey Systems and disease problems which appear as system of Parabolic Partial Differential Equations or System of Ordinary Differential Equations.