Panagiotis Papadimitriou, PhD Senior Director, Data Science & Engineering at Upwork Alumni of Stanford Infolab

Contact

papadimitriou@alumni.stanford.edu

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.

Misc

• Scholar, Linkedin, Twitter, DBLP
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• Maria's homepage
• My name in greek is Παναγιωτης
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