Yejun XU is currently a professor in the College of Management and Economics, Tianjin University, Tianjin China. He received his MS in 2005 and PhD in 2009 both in Management Science and Engineering from Southeast University, China. He has authored and coauthored more than 120 articles in professional journals, such as European Journal of Operational Research, IEEE Transactions on Cybernetics, IEEE Transactions on Systems, Man, and Cybernetics: Systems, IEEE Transactions on Fuzzy Systems, Fuzzy Sets and Systems, Information Sciences, International Journal of Approximate Reasoning, Knowledge-Based Systems, etc. His research interests include group decision-making under uncertainty.