Research manager for the ARPANET project, which developed an experimental computer network, a precursor to the internet. Co-founder of GTE Telenet, an early packet switch service company.
Researcher for the Defense Advanced Research Projects Agency (DARPA) an agency of the government that develops technology for the military. Vice-president of engineering at the Digital Equipment Corporation (DEC).
Member of the ARPANET project, which developed an experimental computer network, a precursor to the internet. Member of the Internet Working Group (IWG), which developed TCP/IP.