Themistoklis Melissourgos
I am a Lecturer (Assistant Professor) in the School of Computer Science and Electronic Engineering at the University of Essex. I am also a member of the Artificial Intelligence group and the Centre for Computational Finance and Economic Agents.
Previously, I was a post-doctoral researcher in the group of Operations Research at TU Munich, headed by Prof. Andreas S. Schulz.
Prior to this, I was a short-term post-doctoral researcher in the Computer Science Department at the University of Liverpool.
I received my PhD from the Computer Science Department at the University of Liverpool, where I was fortunate to be supervised by Prof. Paul Spirakis.
My undergraduate degree is in Electrical and Computer Engineering from the University of Patras.
Research interests
My research interests mainly revolve around Algorithmic Game Theory. I also enjoy working in Computational Social Choice and in the intersection of Theoretical Computer Science and Economics. I study the computational complexity and also exact/approximation algorithms of problems in these fields.
Publications
A full list of publications and manuscripts can be found on DBLP and Google Scholar.
Working papers
On the Smoothed Complexity of Combinatorial Local Search (arXiv)
with Yiannis Giannakopoulos, and Alexander Grosz
Conference papers
Tight Inapproximability for Graphical Games (proceedings, arXiv)
AAAI 2023 (to appear), 37th AAAI Conference on Artificial Intelligence
with Argyrios Deligkas, John Fearnley, and Alexandros HollenderPure-Circuit: Strong Inapproximability for PPAD (proceedings, arXiv, video)
FOCS 2022, 63rd Annual Symposium on Foundations of Computer Science
with Argyrios Deligkas, John Fearnley, and Alexandros HollenderConstant Inapproximability for PPA (proceedings, arXiv, video)
STOC 2022, 54th Annual ACM Symposium on Theory of Computing
with Argyrios Deligkas, John Fearnley, and Alexandros HollenderPizza Sharing is PPA-hard (proceedings, arXiv, video)
AAAI 2022, 36th AAAI Conference on Artificial Intelligence
with Argyrios Deligkas, and John FearnleyWalrasian Equilibria in Markets with Small Demands (proceedings, arXiv, video)
AAMAS 2021, 20th International Conference on Autonomous Agents and MultiAgent Systems
with Argyrios Deligkas, and Paul G. SpirakisConnected Subgraph Defense Games (proceedings, arXiv)
SAGT 2019, 12th International Symposium on Algorithmic Game Theory
with Eleni C. Akrida, Argyrios Deligkas, and Paul G. SpirakisComputing Exact Solutions of Consensus Halving and the Borsuk-Ulam Theorem (proceedings, arXiv)
ICALP 2019, 46th International Colloquium on Automata, Languages, and Programming
with Argyrios Deligkas, John Fearnley, and Paul G. SpirakisApproximating the Existential Theory of the Reals (proceedings, arXiv, video)
WINE 2018, 14th International Conference on Web and Internet Economics
with Argyrios Deligkas, John Fearnley, and Paul G. SpirakisStrategic Contention Resolution in Multiple Channels (proceedings, arXiv)
WAOA 2018, 16th International Workshop on Approximation and Online Algorithms
with George Christodoulou, and Paul G. SpirakisShort Paper: Strategic Contention Resolution in Multiple Channels with Limited Feedback (proceedings, arXiv)
SAGT 2018, 11th International Symposium on Algorithmic Game Theory
with George Christodoulou, and Paul G. SpirakisMutants and Residents with Different Connection Graphs in the Moran Process (proceedings, arXiv)
LATIN 2018, 13th Latin American Symposium on Theoretical Informatics
with Sotiris E. Nikoletseas, Christoforos L. Raptopoulos, and Paul G. SpirakisExistence of Evolutionarily Stable Strategies Remains Hard to Decide for a Wide Range of Payoff Values (proceedings, arXiv)
CIAC 2017, 10th International Conference on Algorithms and Complexity
with Paul G. Spirakis
Journal papers
Approximating the Existential Theory of the Reals (article)
JCSS 2022, Journal of Computer and System Sciences, Volume 125: 106-128
with Argyrios Deligkas, John Fearnley, and Paul G. SpirakisAn Extension of the Moran Process Using Type-specific Connection Graphs (article)
JCSS 2022, Journal of Computer and System Sciences, Volume 124: 77-96
with Sotiris E. Nikoletseas, Christoforos L. Raptopoulos, and Paul G. SpirakisConnected Subgraph Defense Games (article)
Algorithmica 2021
with Eleni C. Akrida, Argyrios Deligkas, and Paul G. SpirakisComputing Exact Solutions of Consensus Halving and the Borsuk-Ulam Theorem (article)
JCSS 2021, Journal of Computer and System Sciences, Volume 117: 75-98
with Argyrios Deligkas, John Fearnley, and Paul G. Spirakis
Surveys
Multi-Agent Systems for Computational Economics and Finance (article, arXiv)
AI Communications 2022, Volume 35, no. 4, pp. 369-380
with Michael Kampouridis, Panagiotis Kanellopoulos, Maria Kyropoulou, and Alexandros A. Voudouris
Academic service
Program committees
International Joint Conferences on Artificial Intelligence (IJCAI) 2024
Conference on Artificial Intelligence (AAAI) 2024
International Symposium on Algorithmic Game Theory (SAGT) 2023
International Joint Conferences on Artificial Intelligence (IJCAI) 2023
Conference on Artificial Intelligence (AAAI) 2023
International Symposium on Algorithmic Game Theory (SAGT) 2022
International Joint Conferences on Artificial Intelligence (IJCAI) 2022
International Joint Conferences on Artificial Intelligence (IJCAI) 2021
Conference on Artificial Intelligence (AAAI) 2020
Reviewing
Conferences: CIAC, OPODIS, WALCOM, IWOCA, NETYS, PODC, DISC, WINE, SAGT, ALENEX, LATIN, ICALP, AAMAS, STACS, SODA
Journals: Random Structures & Algorithms, Theoretical Computer Science, Theory of Computing Systems, Mathematics of Operations Research
Organizing team
Conferences: SAGT 2016, MFCS 2018
Teaching
Teaching Assistant at the University of Liverpool for the following courses:
COMP108: Data Structures and Algorithms (Spring '17-'18)
COMP109: Foundations of Computer Science (Fall '17-'18)
COMP202: Complexity of Algorithms (Spring '16-'17, '17-'18, '18-'19)
COMP219: Advanced Artificial Intelligence (Fall '18-'19)
COMP281: Principles of C and Memory Management (Spring '16-'17)
COMP323: Introduction to Computational Game Theory (Fall '16-'17, '17-'18, '18-'19)
Instructor at the University of Liverpool for the course:
COMP323: Introduction to Computational Game Theory (Fall '19-'20)
Teaching Assistant at TU Munich for the course:
MA5226: Special Topics in Algorithmic Game Theory (Fall '20-'21)
Co-organizer at TU Munich for the seminars:
Complexity of Total Search Problems (Spring '20-'21)
Fair Division: Algorithms, Complexity & Optimization (Fall '21-'22)
Module Supervisor at the University of Essex for the following courses:
CE903: Group Project (Spring '23-'24)
CF962: Quantitative Methods in Finance and Trading (Autumn '22-'23)
CF966: Financial Engineering and Risk Management (Spring '22-'23, '23-'24)
Contact
Address: Office 5A.544, School of CSEE, Colchester campus, CO4 3SQ
Email: themistoklis dot melissourgos at essex dot ac dot uk