I published more than 150 technical papers: among them more than 50 papers in refereed journals and books and more than 40 papers at refereed conferences. I have coauthored two monographs (Nonmonotonic Reasoning (Cambridge University Press), Heterogenous Active Agents (MIT Press)) and 4 invited chapters in books.
In addition, I edited 8 books (Springer LNCS series) and 5 special issues of the Annals of Mathematics and AI. I have organised various international workshops and conferences and several Dagstuhl seminars.
I have been invited for more than 50 talks/tutorials and have given regular classroom lectures for longer terms in Germany, USA, Austria, Argentina, Australia and the UK. I am on the Editorial Board of AI Communications: The European Journal of Artificial Intelligence, of Annals of Mathematics and Artificial Intelligence (AMAI) as well as of Journal of applied Logic. I was Member and Coordinating Node of Agentlink II for The University of Manchester.