He obtained his PhD in 2012 from Seoul National University, Korea, and worked as a researcher (starting research position) in the Inria WILLOW team at the Department of Computer Science, École Normale Supérieure (ENS), Paris, France, until 2016. His research has focused on the interplay between computer vision and machine learning, especially in the problems of graph-based object matching and learning. His recent research investigates unsupervised or minimally-supervised object discovery, localization, matching, and tracking in images and videos.