Christian Matthias Ingemar Martin Matthiessen (born 1956) is a Swedish-born linguist and a leading figure in the systemic functional linguistics (SFL) school, having authored or co-authored more than 100 books, refereed journal articles, and papers in refereed conference proceedings, with contributions to three television programs. One of his major works is ''Lexicogrammatical cartography'' (1995), a 700-page study of the grammatical systems of English from the perspective of SFL. He has co-authored a number of books with Michael Halliday. Since 2008 he has been a professor in the Department of English at the Hong Kong Polytechnic University. Before this, he was Chair of the Department of Linguistics at Macquarie University in Sydney.
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