Since 2005 he is Full Professor of Computer Science at the Second University of Naples (Italy). In 1994 he joined the Institute for Software Technology and Parallel Systems at the University of Vienna (Austria) where he was researcher till 1998.In 1998 he moved at the Second University of Naples (Italy) where he was Assistant Professor till 2002, and Associate Professor till 2005. He is author of more than 100 publications in international journals and conferences, and he is coauthor of a number of international books. He coordinated and participated to a number of research projects supported by Italian, Austrian governments and European Commission (under FP4, FP5 and FP6). He served as general chair, program chair and member in Program Committees of several international conferences, and as guest editor for journals' special issues. He is editorial board member and chair of international journals. He is member of the Executive Board of the IEEE CS Technical Committee.