full professor


Sami Erol Gelenbe (born 22 August 1945) is a Turkish-French computer scientist, electronic engineer and applied mathematician who is professor in Computer-Communications at Imperial College. Known for pioneering the field of modelling and performance evaluation of computer systems and networks throughout Europe, he invented the random neural network and the eponymous G-networks. His many awards include the ACM SIGMETRICS Life-Time Achievement Award, and the in Memoriam Dennis Gabor Award of the Hungarian Academy of Sciences.

Working as a foreigner everywhere, Gelenbe was born in Istanbul in 1945, to Yusuf Ali Gelenbe, a descendant of the 18th-century Ottoman mathematician Gelenbevi Ismail Efendi, and to Maria Sacchet Gelenbe from Cesiomaggiore, Belluno, Italy. After a childhood spent in Istanbul and Alexandria (Egypt), He graduated from Ankara Koleji in 1962 and the Middle East Technical University in 1966, winning the K.K. Clarke Research Award for work on "partial flux switching magnetic memory systems". Awarded a Fulbright Fellowship, he continued his studies at Polytechnic University, where he completed a master's degree and a PhD thesis on "Stochastic automata with structural restrictions", under the supervision of Edward J. Smith. After graduation he joined the University of Michigan as an assistant professor. In 1972, and then on leave from Michigan, he founded the Modeling and Performance Evaluation of Computer Systems research group at INRIA (France), and was a visiting lecturer at the University of Paris 13 University. In 1971 he was elected to the second chair in Computer Science at the University of Liège, where he joined Professor Danny Ribbens in 1973, while remaining a research director at INRIA. In 1973, he was awarded a Doctorat d'État ès Sciences Mathématiques from the Paris VI University with a thesis on "Modèlisation des systèmes informatiques", under Jacques-Louis Lions. He remained a close friend of Professor Ribbens and of the University of Liège, and in 1979, he moved to the Paris-Sud 11 University, where he co-founded the Laboratoire de Recherche en Informatique and its PhD Program, before joining Paris Descartes University in 1986 to found the Ecole des Hautes Etudes en Informatique.

Gelenbe became New Jersey State Endowed Professor at the New Jersey Institute of Technology from 1991 to 1993, and from 1993 and 1998 he was chaired professor and head of Electrical and Computer Engineering at Duke University. From 1998 to 2003 at the University of Central Florida, he founded the Department (School) of Electrical Engineering and Computer Science and developed the Harris Corporation Engineering Centre. 

In 2003, Gelenbe joined Imperial College London as Dennis Gabor Professor in Computer and Communication Networks and Head of Intelligent Systems and Networks.

In 2016 he joined Institute of Theoretical and Applied Informatics, Polish Academy of Sciences, Gliwice Poland.
Notable contributions

Gelenbe has contributed pioneering research concerning the performance of multiprogramming computer systems, virtual memory management, data base reliability optimisation, distributed systems and network protocols. He formed, led, and trained the team that designed the commercial QNAP Computer and Network Performance Modeling Tool. He introduced the Flexsim Object Oriented approach for the simulation in manufacturing systems. He carried out some of the first work on adaptive control of computer systems, and published seminal papers on the performance optimisation of computer network protocols and on the use of diffusion approximations for network performance. He developed new product form queueing networks with negative customers and triggers known as G-networks. He also introduced a new spiked stochastic neural network model known as the random neural network, developed its mathematical solution and learning algorithms, and applied it to both engineering and biological problems. His inventions include the design of the first random access fibre-optics local area network, a patented admission control technique for ATM networks, a neural network based anomaly detector for brain magnetic resonance scans, and the cognitive packet network routing protocol to offer quality of service to users.

From 1984 to 1986 he served as the Science and Technology Advisor to the French Secretary of State for Universities. He founded the ISCIS (International Symposium on Computer and Information Sciences) series of conferences that since 1986 are held annually in Turkey, the USA and Europe to bring together Turkish computer scientists with their international counterparts. According to the Mathematics Genealogy project, Gelenbe has graduated over 72 PhD students, placing him in the Top50 worldwide – all time – PhD supervisors in the mathematical sciences.


Currently works on energy efficient computer systems and self-aware networks, and on network security and on networked auctions. His recent collaborations with biologists include Gene Regulatory Networks and Protein Sequence Alignment.


Horizontal Tabs



1. Czachórski, T., E. Gelenbe, G. Kuaban Suila, and D. Marek, "Transient Behaviour of a Network Router", 43th International Conference on Telecommunications and Signal Processing, Milano, Italy, IEEE, 2020.  (712.6 KB)
2. Fröhlich, P., and E. Gelenbe, "Optimal fog services placement in SDN IoT network using Random Neural Networks and Cognitive Network Map", The 19th International Conference on Artificial Intelligence and Soft Computing, Zakopane, Springer, 06/2020.  (623.07 KB)
3. Gelenbe, E., P. Fröhlich, M. Nowak, S. Papadopoulos, A. Protogerou, A. Drosou, and D. Tzovaras, "IoT Network Attack Detection and Mitigation", The 9th Mediterranean Conference on Embedded Computing (MECO'2020), Budva, Montenegro, June 2020.  (644.89 KB)
5. Gelenbe, E., and M. Pavloski, "Performance of a Security Control Scheme for a Health Data Exchange System", IEEE International Black Sea Conference on Communications and Networking: IEEE, 05/2020.  (342.61 KB)
6. Gelenbe, E., M. Siavvas, P. Boryszko, and J. Domańska, "Optimum checkpoints for time and energy", IEEE MASCOTS 2020, Nice France, IEEEXpress, 10/2020.  (557.59 KB)
7. Baldini, G., P. Fröhlich, E. Gelenbe, J. Luis Hernandez-Ramos, M. Nowak, S. Nowak, S. Papadopoulos, A. Drosou, and D. Tzovaras, "IoT Network Risk Assessment and Mitigation: The SerIoT Approach", Security Risk Management for the Internet of Things: Technologies and Techniques for IoT Security, Privacy and Data Protection, John Soldatos: Now Publishers, pp. 88–104, 2020.  (998 KB)
8. Gelenbe, E., J. Domańska, P. Fröhlich, M. Nowak, and S. Nowak, "Self-Aware Networks that Optimize Security, QoS and Energy", Proceedings of the IEEE, vol. 108, issue 7, July 2020.  (5.07 MB)
9. Fröhlich, P., E. Gelenbe, and M. Nowak, "Smart SDN Management of Fog Services", Global IoT Summit (GIOTS) 2020, Dublin, Ireland, IEEE, June 2020.  (256.06 KB)
11. Gelenbe, E., and Y. Zhang, "Sharing Energy for Optimal Edge Performance", SOFSEM 2020: Theory and Practice of Computer Science, Chatzigeorgiou A. et al., no. Lecture Notes in Computer Science, vol 12011, Cham, Springer, 2020.


13. Kadioglu, Y. Murat, and E. Gelenbe, "Product-Form Solution for Cascade Networks With Intermittent Energy", IEEE Systems Journal, vol. 13, pp. 918–927, 2019.  (638.93 KB)
14. Du, J., E. Gelenbe, C. Jiang, H. Zhang, Y. Ren, and V. H. Poor, "Peer Prediction-Based Trustworthiness Evaluation and Trustworthy Service Rating in Social Networks", IEEE Trans. Information Forensics and Security, vol. 14, pp. 1582–1594, 2019.  (9.62 MB)
15. Gelenbe, E., and Y. Zhang, "Performance Optimization With Energy Packets", IEEE Systems Journal, 2019.
16. Du, J., C. Jiang, E. Gelenbe, H. Zhang, Y. Ren, and T. Q. S. Quek, "Double Auction Mechanism Design for Video Caching in Heterogeneous Ultra-Dense Networks", IEEE Trans. Wireless Communications, vol. 18, pp. 1669–1683, 2019.
17. Hussain, K. F., M. Yousef Bassyouni, and E. Gelenbe, "Accurate, Energy-efficient Classification With Spiking Random Neural Network", Probability in the Engineering and Informational Sciences, 05/2019.
18. Augusto-Gonzalez, J., A. Collen, S. Evangelatos, M. Anagnostopoulos, G. Spathoulas, K. M. Giannoutakis, K. Votis, D. Tzovaras, B. Genge, E. Gelenbe, et al., "From Internet of Threats to Internet of Things: A Cyber Security Architecture for Smart Homes", 24th IEEE International Workshop on Computer Aided Modeling and Design of Communication Links and Networks, CAMAD 2019, Limassol, Cyprus, September 11-13, 2019: IEEE, 2019.
19. Siavvas, M., and E. Gelenbe, "Optimum checkpoints for programs with loops", Simulation Modelling Practice and Theory, vol. 97, 07/2019.
20. Siavvas, M. G., and E. Gelenbe, "Optimum Interval for Application-level Checkpoints", 6th IEEE International Conference on Cyber Security and Cloud Computing, CSCloud 2019 / 5th IEEE International Conference on Edge Computing and Scalable Cloud, EdgeCom 2019, Paris, France, June 21-23, 2019: IEEE, 2019.
21. Gelenbe, E., "Energy Consumption and Quality of Service in Computer Systems and Networks", 23rd IEEE/ACM International Symposium on Distributed Simulation and Real Time Applications DS-RT 2019, Cosenza, Italy, October 7-9, 2019: IEEE, 2019.
22. Diamantopoulos, S., M. Nalin, I. Baroni, F. Clemente, G. Faiella, C. Mesaritakis, E. Grivas, J. Rasmussen, J. Petersen, I. Cano, et al., "Secure Cross-Border Exchange of Health Related Data: The KONFIDO Approach", 15th European Dependable Computing Conference, EDCC 2019, Naples, Italy, September 17-20, 2019: IEEE, 2019.
23. Bi, H., and E. Gelenbe, "A Survey of Algorithms and Systems for Evacuating People in Confined Spaces", Electronics — Open Access Journal, vol. vol. 8, 06/2019.  (2.91 MB)
24. Frötscher, A., B. Monschiebl, A. Drosou, E. Gelenbe, M. J. Reed, and M. F. Al-Naday, "Improve cybersecurity of C-ITS Road Side Infrastructure Installations: the SerIoT - Secure and Safe IoT approach", 2019 IEEE International Conference on Connected Vehicles and Expo, ICCVE 2019, Graz, Austria, November 4-8, 2019: IEEE, 2019.
25. Diamantopoulos, S., D. Karamitros, L. Romano, L. Coppolino, V. Koutkias, K. Votis, O. Stan, P. Campegiani, D. Mari Martinez, M. Nalin, et al., "Secure Cross-Border Exchange of Health Related Data: The KONFIDO Approach", Internet and Distributed Computing Systems - 12th International Conference, IDCS 2019, Naples, Italy, October 10-12, 2019, Proceedings: Springer, 2019.