Athanasios G. Kanatas is a professor at the Department of Digital Systems and Dean of the School of Information and Communication Technologies at the University of Piraeus, Greece. He earned his diploma in electrical engineering from the National Technical University of Athens (NTUA), Greece, in 1991, MSc in satellite communication engineering from the University of Surrey, Surrey, UK, in 1992, and PhD in mobile satellite communications from NTUA, Greece, in February 1997. Dr. Kanatas has published more than 130 papers in international journals and international conference proceedings. Dr. Kanatas has been a senior member of the IEEE since 2002. Athanasios D. Panagopoulos earned his diploma in electrical and computer engineering (summa cum laude) and PhD in engineering from the National Technical University of Athens (NTUA) in July 1997 and April 2002, respectively. Dr. Panagopoulos has published more than 135 papers in international journals and transactions and more than 190 papers in conference proceedings. He has also published more than 25 book chapters in international books. He is the recipient of the URSI General Assembly Young Scientist Award in 2002 and 2005. He is the editor of two international books on mobile and satellite communications.