I received my University Diploma at the Εθνικο Μετσοβιο Πολυτεχνειο (National Technical University of Athens), Greece, and my Master's and Ph.D. from the University of California at Berkeley. I wrote three theses, (i) on routing in data communication networks [Diploma], (ii) on Markovian random fields [Master's], and (iii) on stationarity and stability of stochastic networks [Ph.D.] I worked as a chargé de recherche in INRIA, France, as a lecturer ar U.C. Berkeley, and as a faculty member at the University of Texas at Austin and as a professor at the University of Patras, Greece. Currently, I am with the School of Mathematical Sciences at Heriot-Watt University, Edinburgh, UK. I have held several short and long term research and visiting positions, which include the Cornell University, the Technische Universität Braunschweig, Germany, and the Pennsylvannia State University. I have studied several aspects of applied and theoretical probability, including limit theorems and stochastic processes, and have especially been interested in applications in communication networks. I have given talks in several universities and research institutes, such as at Oberwolfach, Germany, Ecole Normale, Paris, AT&T Labs, EPFL, Switzerland, etc. I have organized several sessions in international conferences (CDC, Informs, Allerton, etc.) I enjoy collaborating with colleagues at several places, which explains my frequently being on the road. My research has been mostly funded by the National Science Foundation. I have organized and taught a number of graduate and undergraduate courses, mostly courses with a stochastic component (Elementary and Advanced Probability, Stochastic Networks, Stochastic Dynamical Systems, Control, Information Theory, Large Deviations, Stochastic Calculus, etc.) I have been a reviewer of what seems an endless number of journal and conference papers, and some research proposals and books. As an associate editor of the journal "Queueing Systems", I have edited or co-edited 3 special issues, on "Mathematics of Communication Networks", on "Approximations and Control of Queueing Networks", and on "Non-conventional stochastic models (heavy tails, long-range dependence, and rare events) in queueing systems". I am an avid reader (and collector) of books of all subjects, and have been trying to play classical guitar for decades, occasionally performing at mathematical audiences (such as the Applied Probability crowd at Oberwolfach). I am a member (on and off, because I am often short of cash) of IEEE, IMS, AMA, MAA.