ORGANIZATION General Chairs Fernando DiazGoogle Chirag ShahUniversity of Washington Torsten SuelNew York University Program Chairs Pablo CastellsUniversidad Autónonoma de Madrid Rosie JonesSpotify Tetsuya SakaiWaseda University Short Paper Chairs Hui FangUniversity of Delaware Claudia HauffTechnische Universiteit Delft Ruihua SongRenmin University of China Perspectives Paper Chairs Fernando DiazGoogle Chirag ShahUniversity of Washington Resource Paper Chairs Yiqun LiuTsinghua University Ian SoboroffNational Institute of Standards and Technology Demo Chairs Miguel MartínezSignal AI Milad ShokouhiMicrosoft Tutorials Chairs Sengor AltingovdeMiddle East Technical University Rodrygo SantosUniversidade Federal de Minas Gerais Doctoral Consortium Chairs Hiroaki OhshimaUniversity of Hyogo Barbara PobleteUniversity of Chile Workshop Chairs Abdigani Dirye Jiafeng GuoChinese Academy of Sciences SIRIP Chairs Hema RaghavanLinkedIn Rishabh MehrotraSpotify Karthik SubbianAmazon Proceedings Chairs Alejandro BellogínUniversidad Autónonoma de Madrid Masaharu YoshiokaHokkaido University Registration Chair Jiqun LiuUniversity of Oklahhoma Virtual Chairs Bhaskar MitraMicrosoft Jian-Yun NieUniversité de Montréal Diversity and Inclusion Barbara PobleteSIGIR RepresentativeUniverity of Chile Hussein SulemanSIGIR RepresentativeUniversity of Cape Town Suzan VerberneSIGIR RepresentativeUniversiteit Leiden Bhaskar MitraDEI LiaisonMicrosoft Sponsorship Chairs Charlie ClarkeUniversity of Waterloo Zhaochun RenShandong University Best Paper Chairs Alistair MoffatThe University of Melbourne Emine YilmazUniversity College LondonAmazon Social Media Chair Johanne TrippasThe University of Melbourne Webmaster Matthew MitsuiVidIQ