Researcher for the Defense Advanced Research Projects Agency (DARPA) an agency of the government that develops technology for the military. Engineer for SRI International, nonprofit scientific research institute and organization.
Director of the Defense Advanced Research Projects Agency (DARPA) Information Science and Technology Office, an agency of the government that develops technology for the military. University of Southern California professor of software engineering.
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.