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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. <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. <ref>[http://www.icann.org/en/biog/jennings.htm ICANN.org]</ref>

===Investments===

===Investments===

He co-founded [[4th Level Ventures]] in 2002, and continues to work there. 4th Level Ventures is a 17 million pound Irish venture capital company; it aims to invest in companies that are commercializing on opportunities arising form Irish research and academic institutions. Dennis is also an angel investor in a variety of early stage technology companies.<ref>[http://www.creditexpo.ie/team/team.html Creditexpo]</ref> As of 2007, Dennis and 4th Level's other founder, [[Ray Norton]], had invested in over a dozen companies as angel investors, and he claims that about half of those investments are looking "very promising".

He co-founded [[4th Level Ventures]] in 2002, and continues to work there. 4th Level Ventures is a 17 million pound Irish venture capital company; it aims to invest in companies that are commercializing opportunities arising form Irish research and academic institutions. Dennis is also an angel investor in a variety of early stage technology companies.<ref>[http://www.creditexpo.ie/team/team.html Creditexpo]</ref> As of 2007, Dennis and 4th Level's other founder, [[Ray Norton]], had invested in over a dozen companies as angel investors, and he claims that about half of those investments are looking "very promising".

Mr. Jennings has been able to take time off from his academic career and develop 4th Level Ventures thanks to an early investment in [[Euristix]] in the 90s; that company was first purchased by Fore Systems for $81 million, and subsequently purchased by [[GEC-Marconi]] for $2.8 billion.<ref>[http://www.independent.ie/business/technology/irelandrsquos-real-net-pioneer-1115628.html Independent.ie]</ref>

Mr. Jennings has been able to take time off from his academic career and develop 4th Level Ventures thanks to an early investment in [[Euristix]] in the 90s; that company was first purchased by Fore Systems for $81 million, and subsequently purchased by [[GEC-Marconi]] for $2.8 billion.<ref>[http://www.independent.ie/business/technology/irelandrsquos-real-net-pioneer-1115628.html Independent.ie]</ref>