CV

Education

  • 2008
    PhD in Information Engineering
    University of Pisa, Italy
  • 2008
    PhD in Computer Engineering
    Technical University of Dortmund, Germany
  • 2002
    MSc in Computer Engineering
    University of Pisa, Italy

Experience

  • 2022 - today
    Associate Professor
    Information Engineering Department, University of Pisa
  • 2019 - 2022
    Assistant Professor
    Information Engineering Department, University of Pisa
  • 2006-2022
    Researcher
    Information Science and Technologies Institute, National Research Council of Italy
  • 2002-2006
    Research Fellow
    Information Science and Technologies Institute, National Research Council of Italy

Honors and Awards

  • 2025
    • ECIR Best Short Paper Award Honorable Mention 2025 for "Efficient Constant-Space Multi-Vector Retrieval"
  • 2024
    • ACM SIGIR Best Paper Runner-up Award 2024 for "A Reproducibility Study of PLAID"
  • 2024
    • ECIR Best Demo Award Honorable Mention 2024 for "indxr - A Python Library for Indexing File Lines"
  • 2023
    • ACM SIGIR Best Paper Award Honorable Mention 2023 for "A Geometric Framework for Query Performance Prediction in Conversational Search"
  • 2023
    • ACM Distinguished Member
  • 2021
    • IIR 2021 Best Long Paper Award for "On Single and Multiple Representations in Dense Passage Retrieval.
  • 2015
    • ACM SIGIR Best Paper Award 2015 for "QuickScorer - A Fast Algorithm to Rank Documents with Additive Ensembles of Regression Trees"
  • 2011
    • LSDS-IR Best Paper Award 2011 for "Query Efficiency Prediction for Dynamic Pruning".
  • 2010
    • LSDS-IR Best Paper Award 2010 for "Efficient Dynamic Pruning with Proximity Support".

Patents

  • Cache optimization via topics in web search engines
    US Patent No. 10,503,792 (Dec. 10, 2019 - Georgetown University)
    Ophir Frieder, Ida Mele, Raffaele Perego, and Nicola Tonellotto
  • A method to rank documents by a computer, using additive ensembles of regression trees and cache optimisation, and search engines using such a method
    US Patent No. 11,106,685 (Aug. 31, 2021 - Istella SpA)
    Domenico Dato, Claudio Lucchese, Franco Maria Nardini, Salvatore Orlando, Raffaele Perego, Nicola Tonellotto, and Rossano Venturini
  • Cache optimization via topics in web search engines
    US Patent No. 11,151,167 (Oct. 19, 2021 - Georgetown University)
    Ophir Frieder, Ida Mele, Cristina Muntean, Franco Maria Nardini, Raffaele Perego, and Nicola Tonellotto.
  • Cache optimization via topics in web search engines
    US Patent No. 11,693,885 (Jul. 4, 2023 - Georgetown University)
    Ophir Frieder, Ida Mele, Raffaele Perego, and Nicola Tonellotto
  • Caching historical embeddings in conversational search
    US Patent No. 12,067,021 (Aug. 20, 2024 - Georgetown University)
    Ophir Frieder, Ida Mele, Raffaele Perego, and Nicola Tonellotto