BARC talk by Quentin Hillebrand 2026

Tuesday, March 24, 2026, 14-15 PM, Quentin Hillebrand, Postdoc at DIKU (UCPH), will be giving a BARC talk on "Improved Differentially Private Algorithms for Rank Aggregation".

Abstract:
Rank aggregation is a task of combining the rankings of items from multiple users into a single ranking that best represents the users' rankings.

In this presentation, we will should how to obtain differentially private algorithm for this problem for 2 different optimality criteria: the footrule rank aggregation and the Kemeny rank aggregation.

Bio:
Quentin joined BARC in October as a postdoc researcher under Rasmus Pagh. He is interested in differential privacy, in particular in studying problems from graph and social choice theory under privacy constraints.

Before joining BARC, Quentin did in PhD on the impact of pre- and post-computation to graph statistics publication under local differential privacy. This PhD was done at The University of Tokyo under the supervision of Prof. Tetsuo Shibuya and Prof. Vorapong Suppakitpaisarn.