March 1996 – August 1996: Department of Physics and Astronomy, University of Wales College of Cardiff, Cardiff, UK, Gravitational Wave Data Analysis Group, under the supervision of Prof. B. Schutz (later on, Director of the Max Planck Institute for Gravitational Physics -Albert Einstein Institute- Potsdam, Berlin, Germany)
Summer 2013: Visiting Professor with the Department of Electrical and Computer Engineering, University of California at San Diego, USA, for a joint research project with Prof. Massimo Franceschetti (J-1 visa held for the visiting period)
Since 2021, he has been a frequent visitor to the WINS Lab (Wireless Information and Network Sciences Laboratory) of LIDS (Laboratory for Information & Decision Systems) at the MIT (Massachusetts Institute of Technology), where he presently holds the Research Affiliate appointment