Before that, he was a researcher at University College London, Space Internetworking Center/Democritus University of Thrace, and DoCoMo Eurolabs in Munich. His research interests lie in the areas of Software-Defined Networks, Cloud Computing and Network Function Virtualization. He participated in many international research projects, such as NECOS (H2020), CORAL (WiSHFUL OC2 project), MEC (MONROE OC2 project), Dolfin (FP7) and UniverSELF (FP7). He has published more than 40 papers in international journals and conferences. He served as a General or TPC Chair for the WWIC 2016 and 2012 conference, the INFOCOM SWFAN 2016, 2017 and the E-DTN 2009 workshops. He was a Guest Editor for the Elsevier Ad Hoc Networks Journal.