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Research

General Research Interests
  • Multiagent systems; artificial intelligence
  • Game theory; social choice theory; market design
  • Algorithms & complexity                                           

Working Papers

  • H. Aziz and C. Ye. Cake Cutting Algorithms for Piecewise Constant and Piecewise Uniform Valuations. 2013. Working Paper. [ Pdf ] (Poster presentation at WINE 2013) [ Slides ]
  • H. Aziz. Consistency of Randomized Assignment Rules. 2013. Working Paper. [ Pdf ]
  • H. Aziz and R. Savani. Hedonic Games.
    In F. Brandt, V. Conitzer, U. Endriss, J. Lang, and A. Procaccia, editors, Handbook of Computational Social Choice. Cambridge University Press, 2014. In preparation.
  • H. Aziz and J. Mestre. Parametrized Algorithms for Random Serial Dictatorship. 2013. Working Paper [ Draft ]
  • H. Aziz, S. Gaspers, N. Mattei, N. Narodytska, T. Walsh, Strategic aspects of the probabilistic serial rule for the allocation of goods [ Pdf ]
  • H. Aziz, S. Gaspers, N. Mattei, N. Narodytska, T. Walsh. Manipulating the Probabilistic Serial Rule.
    Working Paper.
  • H. Aziz, S. Gaspers, N. Mattei, N. Narodytska, T. Walsh. Equilibria under the Probabilistic Serial Rule. Working Paper.
Publications
  • H. Aziz. A Characterization of Stochastic Dominance Efficiency. Economic Theory Bulletin (Accepted 2014).
  • H. Aziz, F. Brandl, and F. Brandt. Universal Pareto Dominance and Welfare for Plausible Utility Functions. 2014. ACM EC 2014. [ pdf ]  (also presented at The 12th Meeting of the Society for Social Choice and Welfare).
  • H. Aziz, F. Brandl, and F. Brandt. On the incompatibility of efficiency and strategyproofness in randomized social choice. 2014. AAAI 2014pdf ]
  • H. Aziz and P. Stursberg. A Generalization of Probabilistic Serial to Randomized Social Choice. AAAI 2014.
  • H. Aziz, S. Gaspers, S. Mackenzie, N. Mattei, P. Stursberg and T. Walsh Fixing a Balanced Knockout Tournament. AAAI 2014. [ Pdf ]
  • H. Aziz and B. Keijzer. Shapley meets Shapley. STACS 2014. [ Pdf ]
  • H. Aziz. A note on the undercut procedure.
    AAMAS 2014. [ Pdf ]
  • H. Aziz, S. Gaspers, S. Mackenzie, T. Walsh. Fair assignment of indivisible objects under ordinal preferences. AAMAS 2014. [ Preprint ]
  • H. Aziz, F. Brandt, and P. Harrenstein. Fractional hedonic games. AAMAS 2014. [ Pdf ]
  • H. Aziz, P. Harrenstein, J. Lang, M. Wooldridge. Boolean Hedonic Games. LOFT 2014.
  • H. Aziz and T. Walsh. Justified Representation in Approval-based Committee Voting. MPREF 2014
  • H. Aziz and S. Gaspers and J. Gudmundsson and S. Mackenzie and N. Mattei and T. Walsh. Computational Aspects of Multi-Winner Approval Voting. MPREF 2014
  • H. Aziz, C. Cahan, C. Gretton, P. Kilby, N. Mattei, T. Walsh. A Study of Proxies for Shapley Allocations of Transport Costs. COOPMAS 2014
  • H. Aziz, F. Brandt and P. Harrenstein. Pareto Optimality in Coalition Formation. Games and Economic Behavior 2013. [ Pdf ]
  • H. Aziz, F. Brandt, and M. Brill. The Computational Complexity of Random Serial Dictatorship. Economics Letters  2013. [ Pdf ] ; also accepted at WINE 2013
  • H. Aziz, F. Brandt and P. Stursberg. On Popular Random Assignments. SAGT 2013. [ Pdf ]
  • H. Aziz. Maximal Recursive Rule: A New Social Decision Scheme. IJCAI 2013. [ Pdf ]
  • H. Aziz, S. Gaspers, N. Mattei, N. Narodytska and T. Walsh. Ties Matter: Complexity of Manipulation when Tie-breaking with a Random Vote. AAAI 2013. [ Pdf ]
  • H. Aziz. Computation of the Random Arrival Rule for the Bankruptcy Problem. Operations Research Letters 2013. 
  • H. Aziz, Markus Brill and Paul Harrenstein. Testing Substitutability of Weak Preferences. Mathematical Social Sciences. 2013. [ Pdf ]
  • H. Aziz. Stable marriage and roommate problems with individual-based stability. AAMAS 2013. [ Pdf ]
  • H. Aziz, F. Brandt, and M. Brill. On the tradeoff between economic efficiency and strategyproofness in randomized social choice. 2012. AAMAS 2013. [ Pdf ] (Poster presentation at WINE 2013)
  • H. Aziz, F. Brandt and H. G. Seedig. Computing Desirable Partitions in Additively Separable Hedonic Games. Artificial Intelligence (AIJ), 2013 [ Pdf ]
  • Franz Diebold, Haris Aziz, Martin Bichler, Florian Matthes, Alexander Schneider Stable Matching Mechanisms - A Field Experiment on Course Allocation Problems. 2013. BISE (Business & Information Systems Engineering)
  • H. Aziz, E. Elkind, M. Wooldridge (Editors). Proceedings of the 4th International Workshop on Cooperative aspects of Multi-agent Systems (CoopMAS), 2013.
  • H. Aziz and B. de Keijzer. Housing Markets with Indifferences: a Tale of Two Mechanisms. AAAI 2012 (also presented at the Frontiers of Market Design Conference and at COMSOC 2012). [ Pdf ]
  • H. Aziz, Markus Brill and Paul Harrenstein. Testing Substitutability of Weak Preferences. MATCHUP 2012 [Preprint].
  • H. Aziz and F. Brandl. Existence of Stability in Hedonic Coalition Formation Games. AAMAS 2012 [ Pdf ].
  • Haris Aziz, M. Brill, F. Fischer, P. Harrenstein, J. Lang, H. G. Seedig. Possible and Necessary Winners of Partial Tournaments. AAMAS 2012. [ Pdf ]
  • H. Aziz, P. Harrenstein, and E. Pyrga. Individual-based stability in hedonic games depending on the best or worst players. AAMAS 2012 (extended abstract). [ Pdf ]
  • H. Aziz, F. Brandt and P. Harrenstein. Pareto Optimality in Coalition Formation. SAGT 2011. 4th Symposium on Algorithmic Game Theory. [ Pdf ]  (Also presented at GAMES 2012ACM EC 2012 and IJCAI-COMSOC 2011.)
  • H. Aziz and B. de Keijzer. Complexity of coalition structure generation. AAMAS 2011, The Tenth International Conference on Autonomous Agents and Multiagent Systems. [ Pdf ]
  • H. Aziz, F. Brandt and H. G. Seedig. Stable partitions in additively separable hedonic games. AAMAS 2011, The Tenth International Conference on Autonomous Agents and Multiagent Systems. [ Pdf ]
  • H. Aziz, Y. Bachrach, E. Elkind and M. Paterson. False-Name Manipulations in Weighted Voting Games. Journal of Artificial Intelligence Research (JAIR), 2011. [Link]
  • H. Aziz, F. Brandt and H. G. Seedig. Optimal partitions in additively separable hedonic games. IJCAI 2011, International Joint Conferences on Artificial Intelligence  (Previously: COMSOC 2010, 3rd International Workshop on Computational Social Choice; also invited for presentation at EURO 2010, 24th European Conference on Operational Research, ` Combinatorial optimization and cooperative game theory session')  [Link | Preprint]
  • H. Aziz and T. Sorensen. Path coalitional games. CoopMAS 2011, The Second Workshop on Cooperative Games in Multiagent Systems [ Pdf ]
  • H. Aziz, F. Brandt, and P. Harrenstein. Monotone cooperative games and their threshold versions. AAMAS 2010, The Ninth International Conference on Autonomous Agents and Multiagent Systems. [Venue | Pdf]
  • H. Aziz, O. Lachish, M. Paterson and R. Savani. Wiretapping a hidden network. WINE 2009, International Workshop on Internet & Network Economics 2009. LNCS 5929 proceedings. [Link | Preprint]
  • H. Aziz, O. Lachish, M. Paterson and R. Savani. Power indices of spanning connectivity games. AAIM 2009, The Fifth International Conference on Algorithmic Aspects in Information and Management,  LNCS 5564 proceedings. [Link | Proceedings | Preprint]
  • H. Aziz and M. Paterson. False name manipulations in weighted voting games: splitting, merging and annexation. AAMAS 2009, The Eighth International Conference on Autonomous Agents and Multiagent Systems. [Link | Proceedings | Pdf]
  • H. Aziz, Algorithmic and computational complexity aspects of simple coalitional games. PhD thesis, 2010. [Abstract]
  • H. Aziz. Social and Economic Networks: a review. ACM Sigecom Exchanges Volume 8.1, 2009 [Link | Pdf]
  • D. Leech and H. Aziz. The double majority voting rule of the EU reform treaty as a democratic, ideal for an enlarging union: an appraisal using voting power analysis. In W. Slomczynski and K. Zyczkowski eds., Distribution of Power and voting procedures in the European Union. Ashgate 2009, ISBN:9780754694960. [Link]
  • H. Aziz, Complexity of comparison of influence of players in simple games. COMSOC 2008, 2nd International Workshop on Computational Social Choice, pp  61-72, 2008. [Link | Proceedings | Pdf]
  • H. Aziz and M. Paterson. Complexity of some aspects of control and manipulation in weighted voting games.  Annales du Lamsade, No. 9, pp 1-16, 2008 ISSN 1762-455X.  [Link]
  • H. Aziz and M. Paterson, Computing voting power in easy weighted voting games, CO 2008 - International Symposium on Combinatorial Optimization 2008. [Link | Pdf]).
  • H. Aziz, M. Paterson, D. Leech. Efficient algorithm for Designing Weighted Voting Games. INMIC 2007, Proceedings of the IEEE Computer Society, 11th IEEE International Multitopic Conference, 2007. [ Pdf ]
  • D. Leech and H. Aziz. The double majority voting rule of the EU reform treaty as a democratic ideal for an enlarging union: an appraisal using voting power analysis. Proceedings of Annual Meeting of the European Public Choice Society 2008, Jena, Germany. [Link | Pdf ] (Previously as D. Leech and H. Aziz, 'Some Properties of the Qualified Majority Voting Provisions of the EU Constitutional Treaty under Various Enlargement Scenarios', International Workshop on the Distribution of Voting Power in the EU, Warsaw, 2007 [venue])
  • H. Aziz. Review of 'Boolean Functions - Theory, Algorithms, and Applications' by Yves Crama and Peter L. Hammer , 2014 ACM SIGACT News.
  • H. Aziz. Review of 'Matching Theory' by László Lovász and M. D. Plummer , 2012 ACM SIGACT News Vol 43, No 3, 2012.
  • H. Aziz. Review of 'In Pursuit of the Traveling Salesman: Mathematics at the Limits of Computation' by William J. Cook' by 2013 ACM SIGACT News Vol 43, No 3, 2012.
  • H. Aziz. Review of 'Graph Theory: A problem Oriented Approach ' by Daniel Marcus , 2011 ACM SIGACT News.
  • H. Aziz. Review of 'P, NP, and NP-Completeness: The Basics of Complexity Theory' by Oded Goldreich, ACM Computing Reviews, 2011 [Link]
  • H. Aziz. Review of  'Princeton Companion to Mathematics' by Gowers, Barrow-Green and Leader. ACM SIGACT News Vol 41, No. 1, 2010  [Link]
  • H. Aziz. Review of 'Multiagent Systems: Algorithmic, Game-Theoretic, and Logical Foundations' by Y. Shoham and K. Leyton-Brown, ACM SIGACT News Vol 41, No. 1, 2010 [Link]
  • H. Aziz. Review of 'Algorithms and Theory of Computation Handbook 2009'.  ACM Computing Reviews, 2010. [Link]
  • H. Aziz. Game theoretic reasoning column. The Reasoner, Volume 4, Number 4, 2010.  [Link]
  • H. Aziz. Modelling Interaction, Dialog, Social Choice, and Vagueness. The Reasoner, Volume 4, Number 5, 2010.  [Link]
  • H. Aziz. COST-ADT Doctoral School on Computational Social Choice. The Reasoner, Volume 4, Number 7, 2010.  [Link]
  • H. Aziz. 'Insight into Game Theory', IMA Mathematics Today. Volume 45, Number 1, February 2009, Page 33 [Link  | Pdf]
  • H. Aziz. Complex graphs and networks (CBMS regional conference series in mathematics): a review.  ACM Computing Reviews, 2009. [Link]
  • H. Aziz. Algorithmic Game Theory: a review, IMA Mathematics Today. Volume 45, Number 2, 2009, Page 80 [ Pdf ]
  • H. Aziz. Review of 'Encyclopedia of Algorithms' by MY KaoACM Computing Reviews, 2009 [Link]
  • H. Aziz. Game Theoretic Problems in Network Economics and Mechanism Design: a review. ACM Computing Reviews, 2009 [Link]
  • H. Aziz and M. Heuer (Editors). 19th Postgraduate Combinatorial Conference (BCC-LMS-DIMAP-OU) Proceedings'. 2008. [Link]
  • H. Aziz. Review of 'Is Mathematics Inevitable? A Miscellany'. 2008. London Mathematical Society Newsletter, Issue 375, Nov 2008 [Link]
  • H. Aziz. Review of 'Algorithmic aspects of graph connectivity (1st ed.)' by H. Nagamochi and T. Ibaraki. ACM Computing Reviews, 2008 [Link]
  • H. Aziz  and M. Heuer. Report on the 19th Postgraduate Combinatorial Conference. London Mathematical Society Newsletter,  Oct 2008, Issue 374. [Link]


Scientific services and affiliations
  • PC member AAAI 2015
  • PC member COMSOC 2014
  • PC member ACM EC 2014
  • PC member AAAI 2014
  • PC member COOPMAS 2014
  • PC member EXPLORE 2014
  • PC member AAMAS 2014
  • SPC member IJCAI 2013
  • Organizer and Co-chair CoopMAS 2013.
  • PC member ACM EC 2012.
  • PC member AAAI 2012.
  • PC member CoopMAS 2012
  • PC member AAMAS 2012.
  • PC member IJCAI 2011.
  • In the ESF (European Science Foundation) Pool of Reviewers 2010-2011.
  • On the committee of BCTCS (2007-2008), BCC (2007-2008), EASSS10 and  EASSS08.
  • Reviewed for ACM Computing Reviews, AIJ (Artificial Intelligence Journal), Computational Intelligence, CUP (Cambridge University Press), DAM (Discrete Applied Mathematics),  Economics Letters, EJOR (European Journal of Operations Research), IPL (Information Processing Letters), JAIR (Journal of Artificial Intelligence Research), Journal of Heuristics, JORS (The Journal of the Operational Research Society) , Computer Science Review, Artificial Intelligence (Elsevier), JAAMAS (Journal of Autonomous Agents and Multi-Agent Systems), MOR (Mathematics of Operations Research), MR (Mathematical Reviews), MSS (Mathematical Social Sciences), SCW (Social Choice & Welfare), Review of Economic Design, TEAC (Transaction on Economics & Computation), Theory & Decision, and TCS Theoretical Computer Science.
  • Reviewed for AAAI Conference on Artificial Intelligence, AAMAS (International Conference on Autonomous Agents and Multiagent Systems), ADT (Algorithmic Decision Theory), COMSOC (International Workshop on Computational Social Choice), EC (ACM Conference on Electronic Commerce), ECAI (European Conference on Artificial Intelligence), ESA (European Symposium on Algorithms), IJCAI (International Joint Conferences on Artificial Intelligence), LATIN (Latin American Theoretical INformatics Symposium), LOFT (International Conference on Logic and the Foundations of Game and Decision Theory.), SAGT (International Symposium on Algorithmic Game Theory), STACS (Symposium on Theoretical Aspects of Computer Science), CSR (International Computer Science Symposium in Russia), ICALP (International Colloquium on Automata, Languages and Programming), SODA (ACM-SIAM Symposium on Discrete Algorithms), and WINE (International Workshop on Internet & Network Economics).
  • Organizer of the 19th Postgraduate Combinatorial Conference,  2008 (PCC08).
  • In the organization team for BCTCS2009 (British Colloquium for Theoretical Computer Science),  Mike66 (Theoretical Computer Science workshop), CO2008 (Warwick Business School) and Algorithmic Game Theory Workshop 2008 and member of the 'Mathematics Today' editorial team.
  • Memberships/Affliiations: ACM (Association for Computing Machinery), AMS (American Mathematical Society), AAAI (Association for the Advancement of Artificial Intelligence), EATCS (European Association of Theoretical Computer Science), DIMAP (Centre for Discrete Mathematics and its Applications (DIMAP), IEEE (Institute of Electrical and Electronics Engineers), INFORMS (Institute for Operations Research and the Management Sciences), Exeter College (Oxford) and Isaac Newton Institute for Mathematical Sciences (Cambridge).

Miscellaneous  
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