Daniel Karrenberg currently serves the RIPE NCC as Chief Scientist. His interests include Internet measurements, the development of the DNS and the evolution of what others often call "Internet Governance". Recently Daniel helped to design, develop and test NSD, a high performance DNS implementation; he also conceived and helped to build dnsmon, a novel comprehensive quality monitor for DNS service.

In the 1990s Daniel helped build the RIPE NCC, the first of the Regional Internet Registries. He led the NCC from its establishment to a size of 59 staff with 20 nationalities, serving 1696 members doing business in 109 countries. Daniel has helped to shape Internet address space distribution policy, transferring both policy development and implementation to the region.

Daniel also brought the second DNS root name server to Europe in 1997 and, being an engineer at heart, helped to install it too.

In the 1980s Daniel helped to build EUnet, a European mail and news network. In particular he led the effort to transition EUnet to Internet protocols, making it the first pan-European ISP; this included the first privately funded trans-atlantic Internet link and brought Internet connections to many places around Europe.