I have been an active researcher in Icelandic and Nordic philology and grammar since 1981 and in general theoretic and descriptive syntax and morphosyntax since 1983. My Icelandic MA dissertation (1983, published 1994) was about Old Norse word order from philological, textlinguistic and syntaxtheoretic perspectives. My Swedish dissertation (1989, republished 1992) anlyzed word formation, word order and Case/case in Icelandic, in comparison with other Germanic languages, within the framework of generative grammar. Until 1985, I mainly studied phonology, morphology and historical linguistics, but after that theoretic and Icelandic and Germanic (morpho)syntax became my major fields of inquiry. Case and agreement have been central in my research, but in recent years I have also focused on Person, Tense and Mood, developing a general theory about the relationship between form and content in these and other grammatical categories.

Books (2)

• Sigurðsson, H. (1994). Um frásagnarumröðun og grundvallarorðaröð í forníslensku. Málfræðirannsóknir, 7. Institute of Linguistics.
• Sigurðsson, H. (1992). Verbal Syntax and Case in Icelandic. Institute of Linguistics.

Editorship (2)

• Delsing, L., Josefsson, G., Sigurðsson, H. & Falk, C. (2003). (Eds.) Grammatik i fokus : festskrift till Christer Platzack den 18 november 2003 = Grammar in focus : festschrift for Christer Platzack 18 November 2003. Vol. 1. Institutionen för nordiska språk, Univ. Lund.
• Delsing, L., Josefsson, G., Sigurðsson, H. & Falk, C. (2003). (Eds.) Grammatik i fokus : festskrift till Christer Platzack den 18 november 2003 = Grammar in focus : festschrift for Christer Platzack 18 November 2003. Vol. II. Grammatik i fokus : festskrift till Christer Platzack den 18 november 2003 = Grammar in focus : festschrift for Christer Platzack 18 November 2003. Vol. II. Institutionen för nordiska språk, Univ. Lund.

Articles (17)

• Sigurðsson, H. (in press). Case variation: viruses and star wars. Nordic Journal of Linguistics, 35.
• Wood, J. & Sigurðsson, H. (in press). Let-causatives and (a)symmetric DAT-NOM constructions. Syntax, 15. Wiley-Blackwell Publishing, Inc.
• Sigurðsson, H. (2012). Minimalist C/case. Linguistic Inquiry, 43, 191-227. MIT Press.
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• Sigurðsson, H. (2011). Conditions on argument drop. Linguistic Inquiry, 42, 267-304. MIT Press.
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• Sigurðsson, H. (2011). On the New Passive. Syntax, 14, 148-178. Wiley-Blackwell Publishing, Inc.
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• Sigurðsson, H. (2011). On UG and materialization. Linguistic Analysis, 37, 367-388. Linguistic Analysis.
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• Sigurðsson, H. (2011). Uniformity and diversity: A minimalist perspective. Linguistic Variation, 11, 189-222. John Benjamins.
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• Sigurðsson, H. (2010). On EPP effects. Studia Linguistica, 64, 159-189. Wiley.
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• Sigurðsson, H. (2009). Language quarks. Iberia: An International Journal of Theoretical Linguistics, 1, 169-183.
• Sigurðsson, H. & Egerland, V. (2009). Impersonal null-subjects in Icelandic and elsewhere. In Holmberg, A. (Ed.) Studia Linguistica (pp. 158-185), 63. Blackwell.
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• Sigurðsson, H. (2008). The case of PRO. Natural Language and Linguistic Theory, 26, 403-450. Kluwer.
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• Sigurðsson, H. (2006). The Icelandic noun phrase: central traits. Arkiv för nordisk filologi, 121, 193-236.
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• Sigurðsson, H. (2006). The Nom/Acc alternation in Germanic. In Hartmann, J. & Molnarfi, L. (Eds.) Comparative Studies in Germanic Syntax (pp. 13-50). John Benjamins Publishing Company.
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• Sigurðsson, H. (2006). The Nominative Puzzle and the Low Nominative Hypothesis. Linguistic Inquiry, 37, 289-308. MIT Press.
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• Sigurðsson, H. (2004). Meaningful silence, meaningless sounds. Linguistic Variation Yearbook, 4, 235-259.
• Sigurðsson, H. (2004). The syntax of Person, Tense, and speech features. Italian Journal of linguistics, 16, 219-251.
• Sigurðsson, H. (2002). To be an oblique subject: Russian vs. Icelandic. Natural Language and Linguistic Theory, 20, 691-724. Kluwer.

Book chapters (16)

• Sigurðsson, H. (in press). The split T analysis. In Eide, K. (Ed.) Finiteness Matters. John Benjamins.
• Sigurðsson, H. (2012). Thoughts on cartography and universality. In Bianchi, V. & Chesi, C. (Eds.) Enjoy linguistics: papers offered to Luigi Rizzi on the occasion of his 60th birthday.
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• Sigurðsson, H. & Maling, J. (2012). Silent heads. In Brugè, L., Cardinaletti, A., Giusti, G., Munaro, N. & Poletto, C. (Eds.) Functional Heads (pp. 368-378). OUP.
• Sigurðsson, H. (2010). Mood in Icelandic. In Rothstein, B. & Thieroff, R. (Eds.) Mood Systems in the Languages of Europe (pp. 33-55). John Benjamins.
• Sigurðsson, H. & Maling, J. (2010). The Empty Left Edge Condition. In Putnam, M. (Ed.) Exploring Crash-Proof Grammars (pp. 59-86). John Benjamins.
• Sigurðsson, H. (2009). Remarks on features. In Grohman, K. (Ed.) Explorations of phase theory (pp. 21-52), 18. Mouton de Gruyter.
• Sigurðsson, H. (2009). The No Case Generalization. In Alexiadou, A., Hankamer, J., McFadden, T., Nuger, J. & Schäfer, F. (Eds.) Advances in Comparative Germanic Syntax (pp. 249-279). John Benjamins.
• Sigurðsson, H. & Holmberg, A. (2008). Icelandic Dative Intervention. In D’Alessandro, R., Fischer, S. & Hrafnbjargarson, G. (Eds.) Agreement Restrictions. Mouton de Gruyter.
• Sigurðsson, H. (2007). Argument features, clausal structure and the computation. In Reuland, E., Bhattacharya, T. & Spathas, G. (Eds.) Argument Structure (pp. 121-158). John Benjamins Publishing Company.
• Sigurðsson, H. & Maling, J. (2007). On null arguments. In Picci, M. & Pona, A. (Eds.) Proceedings of the “XXXII Incontro di Grammatica Generativa” (pp. 167-180). Edizioni dell’Orso. Firenze.
• Sigurðsson, H. (2006). Agree in syntax, agreement in signs. In Boeckx, C. (Ed.) Agreement Systems (pp. 201-237). John Benjamins Publishing Company.
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• Sigurðsson, H. (2006). Um bakstur og boðhátt (‘On baking and the imperative’). Lesið í hljóði fyrir Kristján Árnason sextugan (a Festchrift for Kristján Árnason, 77-81.
• Sigurðsson, H. (2004). Agree and Agreement - Evidence from Germanic. In Abraham, W. (Ed.) Focus on Germanic Typology (pp. 61-103). Akademie Verlag.
• Sigurðsson, H. (2004). Icelandic non-nominative subjects. In Bhaskararao, P. & Subbarao, K. (Eds.) Non-nominative Subjects, Vol 2 (pp. 137-159). John Benjamins.
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• Sigurðsson, H. (2003). Case: abstract vs. morphological. In Brandner, E. & Zinsmeister, H. (Eds.) New Perspectives on Case Theory (pp. 223-268). CSLI Publications.
• Sigurðsson, H. (2003). The Silence Principle. In Delsing, L., Falk, C., Josefsson, G. & Sigurðsson, H. (Eds.) Grammatik i fokus : festskrift till Christer Platzack den 18 november 2003 = Grammar in focus : festschrift for Christer Platzack 18 November 2003. Vol. II (pp. 325-334). Institutionen för nordiska språk, Univ. Lund.

Reports (6)

• Sigurðsson, H. (2006). Fraser och frasstruktur.
• Sigurðsson, H. (2005). Isländsk substantivböjning.
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• Sigurðsson, H. (2005). Om ordföljd i germanska språk.
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• Sigurðsson, H. (2003). Icelandic Reference Grammar.
• Sigurðsson, H. (2002). Infinitives in Icelandic: a despription.
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• Sigurðsson, H. (2002). The Icelandic verb phrase: a description.
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Working papers (6)

• Sigurðsson, H. (2009). Externalization: the case of C/case.
• Sigurðsson, H. & Maling, J. (2008). Argument drop and the Empty Left Edge Condition. Working Papers in Scandinavian Syntax, 81.
• Sigurðsson, H. (2006). PF is more ‘syntactic’ than often assumed. Working Papers in Scandinavian Syntax, 77, pp. 101–128.
• Sigurðsson, H. (2005). Accusative and the Nom/Acc alternation in Germanic. Working Papers in Scandinavian Syntax, 76, pp. 93-133.
• Sigurðsson, H. (2004). Agree in Syntax, Agreement in Signs. Working Papers in Scandinavian Syntax, 74, pp. 1-42.
• Sigurðsson, H. (2002). Agree and agreement: evidence from Germanic. Working Papers in Scandinavian Syntax, 70, pp. 101–156.