Specialist Consultant Library Development, Copenhagen Municipality, eReolen, Denmark
2002-2004: Danish Centre for Evaluation and Health Technology Assessment (DACEHTA), The National Board for Health, Denmark
- Information specialist
2005-2009: Royal School of Library and Information Science, Denmark
- Ph.D. Student and external lecturer with the project “Visual Resources in Cultural Heritage Institutions” in collaboration with The Danish Art Library
- Founded a Nordic chapter of ISKO (“International Society for Knowledge Organization”)
2009-2013: Danish Agency for Library and Media (from 2012 onwards: Danish Agency for Culture through a tri-agency fusion) under the Danish Ministry for Culture
2013-2016 (current): Copenhagen Libraries, Department of Culture and Leisure, City of Copenhagen
Christoffersen, M. (2004) ‘Identifying core documents with a multiple evidence relevance filter’,
Scientometrics, 61(3), pp. 385–394.
Christoffersen, M. (2004) ‘Innovationsdiffusion [The diffusion of innovations]’, Biblioteksarbejde
[Library Work], 70, pp. 29–44.
Christoffersen, M. (2004) ‘Retrieval ovelaps revisited’, International Workshop on Webometrics,
Informetrics and Scientometrics & 5th COLLNET Meeting. Roorke, India, 4 March 2004. COLLNET.
Christoffersen, M. (2008) ‘The bibliographical description of digitalised objects’, Memory in
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ebook service’, Scholarly e-books in your native language : why, why not or when?. Copenhagen,
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England, 21 October 2015. London: Information Today.