Before coming to Ghent, Janse has been editor of Linguistic Bibliography (1982-2004) and professor of linguistics and classics and head of the Department of Arts & Humanities at University College Roosevelt, an international honours college of Utrecht University (2004-2008).
Prior to his time in Ghent, Janse was the editor of Linguistic Bibliography from 1982 to 2004 and held professorial roles at University College Roosevelt, an international honours college affiliated with Utrecht University. He served as a linguistics and classics professor and department head (2004-2008).