Sem Borst received the MSc degree in applied mathematics from the University of Twente, The Netherlands, in 1990, and the PhD degree from the University of Tilburg, The Netherlands, in 1994. During the fall of 1994, he was a visiting scholar at the Statistical Laboratory of the University of Cambridge, England. In 1995, he joined the Mathematics of Networks and Systems department of Bell Laboratories, Lucent Technologies in Murray Hill, USA, as a member of technical staff. Since the fall of 1998, he also holds a part-time position with the Center for Mathematics and Computer Science (CWI) in Amsterdam, and an appointment as a professor of Stochastic Operations Research at Eindhoven University of Technology.

Sem Borst has been a member of several program committees and serves on the editorial boards of various journals, such as Operations Research, Operations Research Letters, and Performance Evaluation. His main research interests are in the performance evaluation of communication networks and computer systems.