Luís Moniz Pereira, born in Lisbon in 1947, is a Professor of Computer Science (retired) at Universidade Nova de Lisboa, and founder and director of CENTRIA (1993-2008), the Centre for Artificial Intelligence at the same University. He was elected a Fellow of the European Coordinating Committee for Artificial Intelligence (ECCAI) in 2001, received a doctor honoris causa degree from the TU Dresden in 2006 and has been part of the Board of Trustees and the Scientific Advisory Board of IMDEA, the Madrid Advanced Studies Software Institute, since 2006. He is the founding president of the Portuguese Artificial Intelligence Association (APPIA), and serves on the editorial boards of various scientific journals. His research, which he has presented in hundreds of publications, focuses on knowledge representation and reasoning, logic programming, and the cognitive sciences. Currently, he is affiliated with the NOVA Laboratory for Computer Science and Informatics (NOVA-LINCS). More detailed information, including his awards, teaching and publications, can be found at http://centria.di.fct.unl.pt/~lmp/.   Ari Saptawijaya, born in Denpasar (Indonesia) in 1976, is an assistant professor at the Faculty of Computer Science, Universitas Indonesia. He received his Master degree in Computational Logic from Technische Universität Dresden in 2004, and a PhD in Informatics from Universidade Nova de Lisboa in 2015. His research interests include knowledge representation and reasoning, logic programming, and the cognitive sciences.