Dennis Diefenbach is a researcher and entrepreneur in the area of Question Answering over Knowledge Graphs.Knowledge Graphs are data repositories that allow to store data in a machine readable way by explicitlyannotating the data semantically, i.e. with their meaning. Question Answering over Knowledge Graphs allows to access this data using natural language.Dennis Diefenbach published over 20 publications in this area in renown Conferences and Journals like the International Semantic Web Conference and the Semantic Web Journal.He is the main contributor of QAnswer, the first AI driven platform to query Knowledge Graphs in natural language.An online service querying large amounts of open data can be found under www.qanswer.eu/qa.