He is involved in research and teaching in the areas of digital communications, communication networks, and stochastic modeling of computer systems and networks. He was a Research Staff Member at the NEC C&C Research Laboratories in Princeton, New Jersey from 1995-1999. In 1999 he was on part-time leave from NEC as a visiting researcher at the Ecole Nationale Sup�rieure des T�l�communications in Paris, France.