Professor Zhe George Zhang is a professor of Management Science in the Department of Decision Sciences, at the College of Business and Economics, Western Washington University. He has published more than 110 papers in prestigious journals such as Management Science, Operations Research, Manufacturing & Service Operations Management, Production and Operations Management, IIE Transactions, IEEE Transactions, Queueing Systems, Journal of Applied Probability. Co-authored with N. Tian, he published the research monograph entitled Vacation Queueing Models - Theory and Applications in 2006 by Springer, which is the first book on this topic and has been widely cited since its publication. Professor Zhang is one of the Editors-in-Chief for Journal of the Operational Research Society, the first Operational Research journal in the world, and one of the founding Editors-in-Chief for new journal Queueing Models and Service Management and is on the editorial board of several international journals.