My name is Dimitris Paparas (Greek: Δημήτρης Παπάρας) and I am a final year theory PhD student at the Computer Science department of Columbia University. My advisor is Prof. Mihalis Yannakakis. Prior to that, I received a BSc in Computer Science and Telecommunications and a MSc in Theoretical Computer Science, both from the Department of Informatics and Telecommunications of the University of Athens, Greece.

- Algorithms
- Complexity Theory
- Computational Economics / Algorithmic Game Theory
- Optimization

I am also interested in the related area of Algorithmic Mechanism Design. In more details, my work aims to understand whether it is possible to generalize the work of Myerson to multi-dimensional settings where there is one seller, one buyer, and n items. A nice property of Myerson’s result is that it provides a closed-form characterization (and thus an efficient algorithm) for the optimal auction when selling one product to many buyers. Is there a closed form characterization for the multi-dimensional setting too? Relaxing the requirement for a closed form characterization, is there an efficient algorithm that implements the optimal auction for the multi-dimensional setting? If you find these questions interesting, this and this are two related papers.

*On the Complexity of Optimal Lottery Pricing and Randomized Mechanisms*, Xi Chen, Ilias Diakonikolas, Anthi Orfanou, Dimitris Paparas, Xiaorui Sun, Mihalis Yannakakis, FOCS 2015 [conference version]*On-Line Profit-Maximization Algorithms for Managing Sponsored Content in Cellular Networks*, Matthew Andrews, Yigal Bejerano, Dimitris Paparas, Evangelia Skiani, 4th Smart Data Pricing (SDP) Workshop, 2015 [conference version]*The Complexity of Optimal Multidimensional Pricing*, Xi Chen, Ilias Diakonikolas, Dimitris Paparas, Xiaorui Sun, Mihalis Yannakakis, SODA 2014 [arxiv, conference version]*The Complexity of Non-Monotone Markets*, Xi Chen, Dimitris Paparas, Mihalis Yannakakis, STOC 2013 [arxiv, conference version]*Clustering on k-Edge-Colored Graphs*, Eric Angel, Evripidis Bampis, Alexander Kononov, Dimitris Paparas, Emmanouil Pountourakis, Vassilis Zissimopoulos , MFCS 2013 [conference version]*Flexible Use of Cloud Resources through Profit Maximization and Price Discrimination*, Konstantinos Tsakalozos, Herald Kllapi, Evangelia Sitaridi, Mema Roussopoulos, Dimitris Paparas, Alex Delis, ICDE 2011 [conference version]

*The Complexity of Non-Monotone Markets*, Xi Chen, Dimitris Paparas, Mihalis Yannakakis, Journal of ACM (Accepted and currently under revision)*The Complexity of Optimal Multidimensional Pricing*, Xi Chen, Ilias Diakonikolas, Dimitris Paparas, Xiaorui Sun, Mihalis Yannakakis, Games and Economic Behavior (Accepted and currently under revision)

*Rank 2 Bimatrix Games are PPAD-hard*, Xi Chen, Anthi Orfanou, Dimitris Paparas, Mihalis Yannakakis*Approximating the actual Equilibrium in Markets with GS utilities*, Dimitris Paparas, Mihalis Yannakakis