Imperial College London


Faculty of EngineeringDepartment of Electrical and Electronic Engineering

Professor in the Dennis Gabor Chair



+44 (0)20 7594 6342e.gelenbe Website




EE Bldg Rm 1009Sherfield BuildingSouth Kensington Campus





Erol Gelenbe, FACM, FIEEE, FIET, of the Electrical and Electronic Engineering Departmentis a Fellow of the Royal Academy of Sciences, Arts and Letters of Belgium (2015), the Hungarian (2010), Polish (2013), Turkish (2012) Science Academies, the National Academy of Technologies of France (2008), and Academia Europaea (2005). Recent keynotes are:  Public engagements include the BBC news:

The REF 2014 evaluation of British Universities recognised the Intelligent Systems and Networks group, which Erol headed from 2004-2016, as having "the highest proportion of world leading outputs" in Imperial's EEE Dept., and the EEE Dept. was Ranked 1st by REF 2014 in the field of Electrical & Electronic Engineering in the UK

Erol Gelenbe launched and developed research on Computer and Network Performance in Engineering and Computer Science across Europe, which has won him numerous awards. He invented mathematical models such as G-networks, and the Random Neural Network and established their product-form asymptotic solutions. He has over 18,000 citations with H = 72, and graduated 76 PhDs including 17 women, placing him as the Top 28th PhD supervisor (worldwide all time) in the Mathematical Sciences (Mathematics Genealogy Project of the American Mathematical Society). He has conducted numerous industry collaborations leading to commercial products such as the QNAP (Simulog, ASTEK) software package for System Performance Analysis and the FLEXSIM (Flexsim) manufacturing system simulation tool, the SYCOMORE (Thales) Voice Packet Switch, and the C2Agents (QinetiQ) Command and Control Decision Aid. 

Three of Erol's former PhD students were elected to their National Academies: the late Jacques Lenfant (Academie des Technologies, French National Academy of Engineering), Catherine Rosenberg (Canadian Academy of Engineering), Francois Baccelli (French National Academy of Sciences). Other former PhD students include Brigitte Plateau, President of the University of Grenoble; Volkan Atalay, former VP and Provost of the Middle East Technical University, Ankara; Taskin Kocak, Dean of Engineering, Bahcesaray University, Istanbul; the late Jacques Lenfant served as President of the University of Rennes I in France.

Several of his former PhD students are industry leaders: Rakesh Kushwaha is founder and CTO of mFormation (sold to Alcatel), Vijay Srinivasan is CEO of Willow TV in California, Zhen Liu was founding director of the Nokia Lab in Beijing (later sold to Microsoft), Yutao Feng is VP of Ambarella Ltd in Shanghai (a video compression company).

Since 2006 he has graduated 18 PhDs at Imperial College and supervised numerous post-docs. Many are now academic faculty members -- mostly in Europe --  at the Universities of Uppsala, Cyprus, Kings College London, Napoli II, Greenwich, Houston (USA), or at Microsoft, Verizon, Alcatel, etc.

Described by E&T Magazine as a "true IT Innovator", Erol won   IET's 2010 Oliver Lodge Medal in the UK. The  ACM SIGMETRICS 2008 Life-Time Achievement Award  awarded to Erol stated that he is "the single individual who, over a span of 30 years, has made the greatest overall contribution to the field of Computer System and Network Performance Evaluation". Other science awards include:

- 2013 "In Memoriam Dennis Gabor Award" of the Hungarian Academy of Science for outstanding science with significant innovation content, from the Hungarian Academy of Sciences (Gabor was the 1971 Nobel Laureate in Physics). 

1996 France-Telecom Prize of the French Academy of Sciences,

- 1994 Parlar Foundation Science Award of Turkey.

Erol has invented and obtained exact solutions, known as "product forms",  to powerful mathematical models for complex system analysis, such as G-Networks and the Random Neural Network (RNN). Product forms correspond to cases where the mean fields provide exact solutions. G-networks and the RNN have non-linear mean fields.

He invented the Cognitive Packet Network patented in 2004, and the first Packet-Voice Network SYCOMORE. The team that he founded, trained and led in Paris, created Europe's  first Network Performance Analysis Package QNAP commercialised by INRIA's spin-off SIMULOG.

For his services to Research and Higher Education, he was awarded honours by several European nations and Universities:

- Chevalier de la Legion d'Honneur (France, 2014), and Officier de l'Ordre du Merite (France, 2001), Chevalier des Palmes Academiques (France, 2003).

- Commendatore al Merito della Repubblica (Italy, 2005), and Grande Ufficiale dell'Ordine della Stella d'Italia (2007).

- Honorary Fellowships (Doctorate Honoris Causa) by the Universities of Liege (Belgium, 2006), Bogazici University - Istanbul (Turkey, 2004), and Rome II (Italy, 1996).

His current research addresses four related areas: 

-  "Autonomic" or self-aware and self-organising Software Defined Networks including the Cognitive Packet Network.

- Energy Savings in ICT, in the Cloud and through Energy Harvesting for sensors in the Internet of Things (IoT)

- Security in mobile networks; he was the coordinator (PI) of the EU FP7 Nemesys project (2012-2015) on Mobile Network Security - see also 

- Reinforcement and Deep Learning with Random Neural Networks; in particular he investigates the effect of dense clusters of cells and of soma-to-soma interactions in neuronal circuits. 

His work has also included analytical solutions to networked systems in engineering, physics and biology, including energy networks, neural networks, genetic networks, sensor networks and economic agents in the Internet.

His publications in the last 10 years appear in journals such as Physical Review, IEEE Networks, IEEE Trans. on Emerging Topics in Computing,  IEEE J. of Selected Areas in Communications, Energies, ACM Performance Evaluation Review, IEEE Access, IEEE Trans. on Cloud Computing, Communications of the ACM, ACM Trans. on Sensor Networks, ACM Trans. on Internet Technology,  Proceedings Royal Society, ACM Trans. on Adaptive and Autonomous Systems, IEEE/ACM Transactions on Bioinformatics and Computational Biology, IEEE Transactions on Nanobioscience, Neural Computation, The Computer Journal, etc.

 Previous positions:

- 1998-2003: Associate Dean of Engineering and Director of the School of Electrical Engineering and Computer Science at the University of Central Florida.  

- 1993-1998: Duke University, Head of Electrical and Computer Engineering and Nello L. Teer Chair Professor, with secondary appointments as Professor of Computer Science and Experimental Psychology.

- 1979-1993: Professor at the University of Paris and also taught at Ecole Polytechnique. In France, he created research groups in Computer and Network Performance Evaluation at INRIA, CNRS and French universities, founded two post-graduate programmes, introduced system and network performance evaluation methods to France Telecom, Bull, ONERA, invented fiber optics random access networks and multiprocessor packet switches, and developed methods that were incoprporated into commercial performance evaluation software packages such as QNAP2 and FLEXSIM.

- He was elected to his first Chair at the age of 27 at the University of Liege (Belgium).

Erol's recent projects include ECROPS/EPSRC (2013-2016) which was ranked first in the 2012 CHIST-ERA competition,  EU FP7 NEMESYS (2012-2015) on mobile network security, EU FP7 PANACEA (2013-2016) on the resilient Cloud, a MoD/DSTL project on energy optimisation (2012-2016). Recently completed projects include SATURN on Network Security (BT and the Technology Strategy Board), Fit4Green on Green ITC (EU FP7), EPSRC/KTN with MBDA UK Ltd, EPSRC Bridging the Gaps in Bioinformatics, (5) ALADDIN on Distributed Data and Decision Systems (BAE Systems and EPSRC), and EU FP7 DIESIS on Distributed Simulation of Critical Infrastructures. He teaches a post-graduate course on the performance of distributed systems and networks. For recent publications see: and

Erol served as Science and Technology Advisor to the French Minister of Universities (1984-86). In 1982 he created a voluntary programme to provide Computer Technology education to unemployed people (Programme VFI) in France that served some 17,000 trainees over several years with the help of volunteers having engineering and computer science degrees.  He serves on the board of several journals such as Acta Informatica, Performance Evaluation, Computational Management Science. Previous editorial boards include the Proceedings of the Royal Society (2006-2011), Proceedings IEEE (1994-1998), and The Computer Journal (2008-2012). He is currently General Chair for MASCOTS 2016.

Specific Details: Prof. Erol Gelenbe works on computer and network system performance evaluation methods and tools, and his work was incorporated into the QNAP2 commercial software package, and the design of FLEXSIM a commercial flexible manufacturing system simulator. His laboratory includes a large scale wired network test-bed, an ad hoc wireless network that incorporates power aware routing, wireless sensor networks, and a large scale distributed simulation tool DBES for emergency management. Recent industry collaborations include BT, BAE Systems, GD UK Ltd, QinetiQ, MBDA, Northrup-Grumman, Telecom Italia, Huawei. 

Erol also introduced new computational models of biological systems, including the "Random Neural Network" and a probability model for Gene Regulatory Networks which includes temporal effects. The "Random Neural Network " has resulted in a patented technique for anomaly detection in Magnetic Resonance Images of the brain, and in the patented CPN algorithm for QoS routing in "autonomic" or self-aware adaptive networks (, and in patents awarded for fast real-time distributed real-time decision making. Some of his recent work analyses the time that it takes to "search" when one has imperfect or wrong information about the location of the object that is being sought; this is relevant to wireless networks, to robotics and optimisation.

His early work contributed seminal results on the performance and implementation of random access multi-user communications and fibre networks, diffusion models of multi programming systems, adaptive performance of virtual memory systems, optimum checkpoints in databases, and the performance of database operations. 

Please see:

Royal Academy of Sciences, Arts and Letters of Belgium

French National Academy of Engineering

Hungarian Academy of Sciences 

Polish Academy of Sciences

Turkish Science Academy

Academia Europaea



Du J, Gelenbe E, Jiang C, et al., Contract Design for Traffic Offloading and Resource Allocation in Heterogeneous Ultra-Dense Networks, Ieee Journal on Selected Areas in Communications, ISSN:0733-8716


Czachorski T, Gelenbe E, Lent R, Information Sciences and Systems 2014, Proceedings of the 29th International Symposium on Computer and Information Sciences

Gelenbe E, Abdelrahman OH, Gorbil G, et al., Information Sciences and Systems 2015, International Symposium on Computer and Information Sciences 2015, ISSN:1876-1119

Gelenbe E, Lent RM, Computer and Information Sciences III, International Symposium on Computer and Information Sciences 2012

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