Ondřej Caletka

Based in Amsterdam

Ondřej Caletka joined the RIPE NCC in 2020. He works as a technical expert in the Learning and Development team. His main responsibility includes developing and operating the lab environment for training courses and online learning. Ondřej graduated from Czech Technical University in Prague and worked as network services administrator and developer for the Czech national research and education network CESNET before joining the RIPE NCC. He is also active in local IT communities around open source/free software, and acts as an IPv6 and DNSSEC ambassador, delivering talks and trainings at various events.

Luuk Hendriks

Luuk is a research engineer at NLnet Labs, focusing on measurements and analyses of core Internet protocols.

Vesna Manojlovic

Vesna Manojlovic is Community Builder at RIPE NCC. Vesna joined the RIPE NCC as a Trainer in 1999. In 2003, she took responsibility for developing and delivering advanced courses, such as RPSL, Routing Registry, DNSSEC and IPv6. In 2008, she lead efforts to establish IPv6 RIPEness as a measure of IPv6 deployment among LIRs. In 2011, she joined the Science Division as Manager of the Measurements Community Building team; in 2015 she moved to Communications Department as Senior Community Builder, with a focus on organising hackathons. Vesna gives presentations at many technical conferences and workshops, and enjoys visiting hackerspaces. Vesna received a Batchelor of Sciences Degree in Computer Science and Informatics from the School of Electrical Engineering, University of Belgrade. She has three children.

Koen van Hove

Koen van Hove is a researcher at the University of Twente on the topic of network security, with a focus on DoS-risks. His most notable contributions are to the DDoS Clearing House and RPKI Relying Party Resiliency Platform.

George Michaelson

George Michaelson is currently APNIC's senior R&D scientist. Recently, he has been working on long-baseline IPv6 and DNS statistics using Internet-wide end-user measurement, services logging, audit and analysis, and design and implementation of the Internet Number Resource Certification framework. George is a member of the BCS, and a founder member of the Australian chapter of the Internet Society. He participates regularly in IETF standardisation meetings, and co-authors Request For Comment (RFC) documents, technical drafts, and conference and peer-review papers. George graduated from York University in 1982 with a BSc in Computer Science. His career in the United Kingdom and Australia has pursued research and development in computer science, networking, and systems administration.