Klaus-Dieter Althoff studied mathematics with focus on artificial intelligence (AI) at the University of Aachen. He made both his PhD on learning knowledge-based systems and his habilitation degree on evaluating case-based reasoning systems at the University of Kaiserslautern. From 1997 to 2004 he was responsible for experience management and learning software organizations at the Fraunhofer Institute for Experimental Software Engineering (SE) (first as group leader finally as department head). From 2004 to 2010 he had a professorship of applied computer science and since 2010 of artificial intelligence, both at the University of Hildesheim. Main areas of his scientific work are (semi-automated) development, maintenance, distribution/combination, explanation, and systematic improvement of experience based systems."Experience-based systems'' was selected as one of the ten significant technologies in German AI history by the Gesellschaft für Informatik e.V. (GI) as part of the "#KI50'' project. (GI). Current focus is the integration of AI methods (CBR, multi-agent systems, machine learning) and SE methods (experience factory, software product lines) for developing / maintaining explanation-aware distributed knowledge-based systems (e.g., with applications for diagnosis and maintenance in the aircraft domain, for supporting the conception phase in design, for service support, and for computer games). He is reviewer of many journals, conferences, and workshops and he was (co-)chair and/or (co-)organizer of many conferences and workshops. From 2001 to 2017 he was co-editor and editor-in-chief of the German Journal of AI of FBKI, the AI subsection of Gesellschaft für Informatik (GI). Since many years he is an active member of the FBKI subsections on Knowledge Management as well as on Knowledge Discovery Data Mining Machine Learning.