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Dr. Jennings was the director of University College Dublin (UCD) Computing Services from 1977 to 1999; he was responsible for the university's IT infrastructure and a staff of over 90 people. In 1986, he took leave from the University and acted as interim President of the Consortium for Scientific Computing at the John von Neumann Centre (JvNC) in Princeton, New Jersey; he took charge of starting its super computer center. Dennis is currently acting as Chairman of the Oversight Board of the Irish Centre for High-End Computing (ICHEC). <ref>[http://www.icann.org/en/biog/jennings.htm ICANN.org]</ref>
Dr. Jennings was the director of University College Dublin (UCD) Computing Services from 1977 to 1999; he was responsible for the university's IT infrastructure and a staff of over 90 people. In 1986, he took leave from the University and acted as interim President of the Consortium for Scientific Computing at the John von Neumann Centre (JvNC) in Princeton, New Jersey; he took charge of starting its super computer center. Dennis is currently acting as Chairman of the Oversight Board of the Irish Centre for High-End Computing (ICHEC). <ref>[http://www.icann.org/en/biog/jennings.htm ICANN.org]</ref>
===NSFnet===
He was also integral in creating [[NSFnet]], in 1985-86, which is the network that preceded the Internet.<ref>[http://www.creditexpo.ie/team/team.html CreditExpor.ie]</ref> Thus, he was directly responsible for creating the internet as we know it; it was his decision to use the [[TCP/IP]] Protocols out of the military ([[DARPA]]) and select academic environments, where they exclusively existed, and link together 300+ universities. It was an ambitious move that he believes would have happened eventually; but, alas, he was the one responsible and he paved the way for the further expansion of the network into the Internet through his work. The initiative that he led cost the U.S. government some $17 million USD.<ref>[http://www.independent.ie/business/technology/irelandrsquos-real-net-pioneer-1115628.html Independent.ie]</ref>
==Roles==
==Roles==
A selection of some of Dr. Jennings' more important roles:
A selection of some of Dr. Jennings' more important roles: