University of Bologna - Content-based retrieval, data models, query languages, similarity queries, fuzzy retrieval, the M-tree, signature files, grid files, schema-based navigation, structures on the web.
University of Udine - Knowledge-based systems (diagnosis, temporal reasoning, modeling of physical systems, qualitative reasoning) and human-computer interaction (desktop virtual reality, information visualization, 3d, multimedia and multimodal interf...
Brown University - Influential researcher in Natural Language Processing and Artificial Intelligence. His home page features some of his publications, in postscript.