1. a Associate Professor, Department of Mechanical Engineering , University of Texas , Austin, Texas, 78712, U.S.A.
2. b Professor, Faculty of Industrial Engineering and Management , Technionmdash; , Israel Institute of Technology, Haifa, 32000|Israel
3. c Visiting Associate Professor, The Owen Graduate School of Management , Vanderbilt University , Nashville, Tennessee, 37293, U.S.A.
4. d Department of Industrial Engineering , Tel-Aviv University , Ramat, Aviv, 69978, Israel