Siegfried Nijssen is assistant professor at the Université catholique de Louvain. Together with Tias Guns, he developed the CP4IM framework for mining itemsets using constraint programming. He published numerous other papers concerning the discovery of patterns in data and the use of declarative languages in data mining. He has published at KDD, ICDM, ECMLPKDD, ICML, IJCAI and ECAI, among others. He was program chair of ECMLPKDD in 2013, is senior PC member of KDD and ICDM, associate editor of the KAIS journal and editor for the DMKD and ML journals.