Zhaochun Ren



Snellius, Niels Bohrweg 1 2333 CA Leiden, the Netherlands

I’m now an Associate Professor at Leiden University, the Netherlands. I am interested in information retrieval and natural language processing, with an emphasis on conversational artificial intelligence, recommender systems, and social media analysis. I aim to develop intelligent agents that can address complex user requests and solve core challenges in NLP and IR towards that goal. I got my PhD from University of Amsterdam in 2016, supervised by Prof. Dr. Maarten de Rijke. Prior to that, I received my B.E and M.E from Shandong University in 2009 and 2012 respectively, and worked as a short-term visiting scholar in Max-Planck-Institut für Informatik, 2012.

Research interests

Information Retrieval:

  • Recommender systems
  • Conversational IR
  • Personalized search and QA
  • Legal IR systems and applications
  • Interactive IR applications

Natural Language Processing:

  • Dialogue systems
  • Summarization and tagging
  • Knowledge representation and distillation


Oct, 2023 2 papers have been accepted at WSDM 2024!
Oct, 2023 8 papers have been accepted at EMNLP 2023!
Jan, 2023 I serve as an associate editor of Information Processing & Management.
Nov, 2022 Two papers about reducing hallucination in dialogue system and debiased natural language understanding were accepted by AAAI’23.
Oct, 2022 One paper about user behavior leakage in recommender systems was accepted at TOIS.