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Research Interests Advertising Data mining Data privacy Labor marketplaces Web search Education PhD, Electrical Engineering, Stanford University, 2006 – 2011 Dissertation title: "Algorithms and Strategies for Web Advertising" Advisor: Hector Garcia-Molina MS, Electrical Engineering, Stanford University, 2006 – 2008 Depth area: Dynamic Systems and Optimization DiplEng, Electrical and Computer Engineering, NTUA, 2001 – 2006 Major: Computer Science Research Work Labor Marketplaces Client Clustering for Hiring Modeling in Work Marketplaces, KDD2015 (joint work with Vasilis Verroios and Ramesh Johari), Aug 2014 On Hiring Decisions in Online Labor Markets, WSDM2015 (joint work with Marios Kokkodis and Panos Ipeirotis), Jul 2014 WorkerRank: Using Employer Implicit Judgements to Infer Worker Reputation, WSDM2015 (joint work with Maria Daltayanni, and Luca de Alfaro), Dec 2014 On Assigning Implicit Reputation Scores in an Online Labor Marketplace, EDBT2014 (joint work with Maria Daltayanni, Luca de Alfaro and Panayiotis Tsaparas), Dec 2013 Advertising Sponsored Search Auctions with Conflict Constraints, WSDM2012 (TR, code) (joint work with Hector Garcia-Molina), Aug 2011 Display Advertising Impact: Search Lift and Social Influence, KDD2011 (TR) (joint work with Prabhakar Krishnamurthy, Randall Lewis, David Reiley and Hector Garcia-Molina), Feb 2011 Output URL Bidding, VLDB2011 (TR, slides) (joint work with Hector Garcia-Molina, Ali Dasdan and Santanu Kolay), May 2010 Output Bidding: A New Search Advertising Model Complementary to Keyword Bidding, AdAuctions2009 (joint work with Ali Dasdan, Santanu Kolay and Hector Garcia-Molina), Jul 2009 Privacy Data Leakage Detection, TKDE2011 (TR, poster) (joint work with Hector Garcia-Molina), Dec 2009 Distributed Privacy Preserving Data Collection using Cryptographic Techniques, TR (joint work with Mingqiang Xue, Cheddy Raissi, Panos Kalnis and Hung Keng Pung), Jun 2009 A Model for Data Leakage Detection, ICDE2009 (joint work with Hector Garcia-Molina), Jun 2008 Other TACI: Taxonomy-Aware Catalog Integration, TKDE2013 (joint work with Panayiotis Tsaparas, Ariel Fuxman and Lise Getoor), Feb 2012 Web Graph Similarity for Anomaly Detection, JISA2010 (TR) (joint work with Ali Dasdan and Hector Garcia-Molina), Jan 2010 Web Graph Similarity for Anomaly Detection, WWW2008 (poster) (joint work with Ali Dasdan and Hector Garcia-Molina), Jan 2008 Design and Implementation of a Large Scale Profile and Location Based Services System (Demo) (joint work with Ioannis Koltsidas), Diploma Thesis at NTUA, Jun 2006 Patents Panagiotis Papadimitriou, Prabhakar Krishnamurthy, Frederick Kenneth Smith. Method and System for Generating Web Pages for Topics Unassociated with a Dominant URL. US Patent Application No. 20120158693. Filed in Dec 2010. Panayiotis Tsaparas, Panagiotis Papadimitriou, Ariel Fuxman, Lise Getoor, Rakesh Agrawal. Object Classification Using Taxonomies. US Patent Application No. 20100185577. Filed in Mar 2009. Ali Dasdan, Panagiotis Papadimitriou. Methods and Apparatus for Computing Graph Similarity via Signature Similarity. US Patent No. 8,019,708. Issued in Sep 2011. Ali Dasdan, Panagiotis Papadimitriou. Methods and Apparatus for Computing Graph Similarity via Sequence Similarity. US Patent No. 7,996,349. Issued in Aug 2011.