Researcher in network science, and wireless ad hoc and sensor networking with interests spanning almost all aspects of the field -- theory/algorithms, systems, and applications. Currently the Consortium-wide Lead in a portion of the Network Science Collaborative Technology Alliance (NS CTA) program led by BBN with 30+ universities and industrial R&D labs participating; also, the Principal Investigator from BBN in the bilateral (US & UK governments) International Technology Alliance (ITA) program. Past significant roles include Chief Architect in the DARPA Disruption Tolerant Networking (DTN) program. Interested in the development of both innovative concepts and academic research problems in the field.