About Us


Centre Ambassadors

Ambassador is an honorary title for a former staff member of the Centre, who is an internationally acknowledged expert in cyber defence related field and is invited to continue an affiliation with the Centre.

LTC Christian Czosseck

LTC Czosseck has been with the German Army for more than 15 years. After his initial time as a cadet and later a platoon commander in the NBC branch, he became IT professional and for the last 9 years was holding different information assurance and IT management positions. Following his 4-years turn (2008-2012) as scientist to the Centre, he is now serving at the CERT of the German Armed Forces (CERT Bundeswehr) and currently holds the position of Head Cyber Defence Laboratory.

LTC Czosseck holds a Ph.D. in Management from the Estonian Business School (Tallinn) and is a distinguished graduate in Computer Science from the military university in Munich. His current research focus is on cyber security and cyber weapons with a particular focus on the role of botnets. He has edited numerous conference proceedings and frequently serves as a programme committee member for cyber-related conferences.

Dr Kenneth Geers

Kenneth Geers (PhD, CISSP) is a COMODO Senior Research Scientist based in Toronto, Canada. In addition to being a NATO Cooperative Cyber Defence Centre of Excellence (NATO CCD COE) Ambassador, Dr. Geers is a Non-Resident Senior Fellow at Atlantic Council, an Affiliate with the Digital Society Institute-Berlin, and a Visiting Professor at Taras Shevchenko National University of Kyiv in Ukraine. Kenneth spent 20 years in the U.S. Government, with time in the U.S. Army, at NSA, NCIS, and NATO, and was a Senior Global Threat Analyst at FireEye. He is the author “Strategic Cyber Security”, editor of “Cyber War in Perspective: Russian Aggression against Ukraine”, editor of “The Virtual Battlefield: Perspectives on Cyber Warfare”, technical expert to the Tallinn Manual, and author of 20+ articles and chapters on cyber security. Follow him on Twitter @KennethGeers.

CPT Markus Maybaum

Markus Maybaum is a German Air Force officer with more than 20 years of professional experience in the field of IT and IT security. He worked in several different national and international management, leadership and expert positions focusing on information technology, software engineering, cyber security and arms control. 
Markus was assigned to NATO CCD COE’s Technology Branch from 2012 to 2015 as a researcher where he managed CyCon’s Technical Track. He is still actively contributing to the mission of the Centre as a NATO CCD COE ambassador. Currently, Markus is working for the Bundeswehr Cyber Security Centre in the field of penetration testing and he is also working for Fraunhofer FKIE’s Cyber Analysis & Defense department as a researcher focusing on cyber arms control and trusted architectures.

Dr Rain Ottis

From 2008 to 2012 Dr Rain Ottis served as a scientist at the Centre, where he worked on strategic analysis and concept development in the context of national and international cyber security. He has profoundly contributed to the Centre's technical exercises and annual conferences, and was among the co-authors of the Tallinn Manual.

Prior to his assignment at the Centre, he served as a communications officer in the Estonian Defence Forces, focusing primarily on cyber defence training and awareness. In addition to his current assignment, he is teaching cyber security in University of Jyväskylä, Finland. He is a graduate of the United States Military Academy (BS, Computer Science) and Tallinn University of Technology (PhD, Computer Science; MSc, Informatics). His research interests include cyber conflict, national cyber security, politically motivated cyber attacks and the role of volunteers in cyber security.

Ms Liis Vihul

Liis Vihul was a member of the Law and Policy Branch in 2008-2017. Her work focused on public international law, including serving as the managing editor of the Tallinn Manual 2.0 on the International Law Applicable to Cyber Operations, co-directing the Centre’s International Law of Cyber Operations course, and developing the legal play concept for Locked Shields exercise.
Currently, Liis Vihul is the Chief Executive Officer of Cyber Law International, a boutique international law training and consultancy firm. She also serves as co-editor of the International Humanitarian Law Group in the Manual on International Law Applicable to Military Uses of Outer Space project and Deputy Chair of the newly founded Global Commission on the Stability of Cyberspace’s Research Advisory Group. She holds master’s degrees in law from the University of Tartu and in information security from the University of London. In 2016, she was awarded the Golden Badge of the Estonian Ministry of Defence for her work in international cyber law.