a) Manuscripts reviewed for:

• Canadian Journal of Linguistics
• Dialectica
• Erkenntnis (on editorial board since 1990)
• Journal of Cognitive Science
• Journal of Logic, Language and Information
• Journal of Philosophical Logic
• Journal of Semantics (member of editorial board from 1994 to 2009, member of the advisory board from 2010-2020)
• Journal of Symbolic Logic
• [Research on] Language and Computation
• Lingua
• Linguistic Inquiry
• Linguistics
• Linguistics and Philosophy (Associate Editor 2003–2010, since then Editor-in-Chief [together with Graeme Forbes]) (+ book series Studies in Linguistics and Philosophy)
• Linguistische Berichte
• Natural Language and Linguistic Theory
• Natural Language Semantics
• Notre Dame Journal of Formal Logic
• Review of Symbolic Logic
• Semantics and Pragmatics (member of Editorial Board from 2007 to 2013, currently on Advisory Board)
• Snippets
• Synthese
• Theoretical Linguistics
• Zeitschrift für Sprachwissenschaft

b) Books reviewed for:

• Brill (Leiden)
• CSLI (Stanford)
• Cambridge University Press
• Kluwer Academic Publishers (Dordrecht & Boston)
• MIT Press (Cambridge, Mass.)
• Oxford University Press

c) Dissertations reviewed:

• Paul McNamara. Promotion University of Massachusetts at Amherst 1990. Title of dissertation: The Deontic Quadecagon [external referee]
• David Forster. Promotion University of Massachusetts at Amherst 1990. Title of dissertation: The Generation of Temporal Expressions in Natural Language [external referee]
• Reinhard Blutner. Dr. phil. habil. Humboldt-Universität Berlin 1995. Title of dissertation: Standardannahmen, Informationsveränderung und Flexibilität ['Default assumptions, information change, and flexibility']. [external referee]
• Bart Geurts . Dr. phil. Universität Stuttgart 1995. Title of dissertation: Presupposing. [second opinion]
• Regine Eckardt. Dr. phil. Universität Stuttgart 1996. Title of dissertation: Events, Adverbs and Other Things. [supervisor]
• Heike Wiese. Dr. phil. Humboldt-Universität Berlin 1997. Title of dissertation: Zahl und Numerale [Number and numeral]. [external referee]
• Friederike Moltmann .Dr. phil. habil., Universität Stuttgart 1997. [second opinion]
• Anette Frank . Dr. phil. Universität Stuttgart 1997. Title of dissertation: Context Dependence in Modal Constructions. [second opinion]
• Robert van Rooy . Dr. phil. Universität Stuttgart 1997. Title of dissertation: Attitudes and Changing Contexts. [supervisor]
• Joachim Sabel . Habilitation Universität Frankfurt 1999. Title of dissertation: Principles and Parameters of Wh-Movement. [external referee]
• Jochen Zeller . Promotion Universität Frankfurt 1999. Title of dissertation: Particle Verbs, Local Domains, and a Theory of Lexical Licensing . [third opinion]
• Peter Krause. Promotion Universität Stuttgart 2001. Title of dissertation: Topics in Presupposition Theory. [second opinion]
• Ágnes Bende-Farkas. Promotion Universität Stuttgart 2002. Title of dissertation: Verb-Object Dependencies in Hungarian and English. [second opinion]
• Ron Artstein. Promotion Rutgers University, New Brunswick (New Jersey) 2002. Title of dissertation: Phonological Decomposition. [external referee]
• Malte Zimmermann . Promotion Universiteit van Amsterdam 2002. Title of dissertation: Boys Buying Two Sausages Each. [Copromotor]
• Sigrid Beck. Kumulative Habilitation Universität Frankfurt 2003. [supervisor]
• Eric Fuß . Promotion Universität Frankfurt 2005. Title of dissertation: The Rise of Agreement. [third opinion]
• Philippe Schlenker. Kumulative Habilitation Ecole des Hautes Etudes en Sciences Sociales (Paris) 2005. [external referee]
• Veerle Van Geenhoven. Kumulative Habilitation Universität Frankfurt 2005. [supervisor]
• Bartosz Wieckowski. Promotion Universität Tübingen 2006. Title of dissertation: Modality without Reference. [second opinion]
• Magdalena Schwager. Promotion Universität Frankfurt 2006. Title of dissertation: Interpreting Imperatives. [supervisor]
• Jiro Inaba. Promotion Universität Frankfurt 2006. Title of dissertation: Die Syntax der Satzkomplementierung. Zur Struktur des Nachfeldes im Deutschen. [second opinion]
• Emar Maier. Promotion Universität Nijmegen 2006. Title of dissertation: Belief in Context. [external referee]
• Verena Mayer. Promotion Universität Frankfurt 2006. Title of dissertation: On the Semantics and Pragmatics of Explicit Performatives. [supervisor]
• Cornelia Endriss. Promotion Universität Potsdam 2007. Title of dissertation: Quantificational Topics. [external referee]
• Magdalena Roguska. Promotion Universität Mainz 2007. Title of dissertation: Exklamation und Negation. [second opinion]
• Andreas Runkel. Promotion Universität Frankfurt 2007. Title of dissertation: Explicit Performatives. [second opinion]
• Andreas Haida. Promotion Humboldt-Universität Berlin 2008. Title of dissertation: The Indefiniteness and Focusing of Wh-Words. [second opinion]
• Stefan Enzinger. Promotion Goethe-Universität Frankfurt 2008. Title of dissertation: Kausative und perzeptive Infinitivkonstruktionen: Syntaktische Variation und semantischer Aspekt. [second opinion]
• Eric Fuß. Habilitation Goethe-Universität Frankfurt 2009. Titel der Habilitationsschrift: Word Order and Language Change. [third opinion]
• Claudia Poschmann. Promotion Johannes Gutenberg-Universität 2010. Title of dissertation: Echo-Fragen. Eine fokusbasierte Metarepräsentations-Analyse. [second opinion]
• Jasper Liptow. Habilitation Goethe-Universität Frankfurt 2010. Title of dissertation: Begriffe im Denken. Grundlagen einer philosophischen Begriffstheorie. [referee]
• Peter Öhl. Kumulative Habilitation Goethe-Universität Frankfurt 2010. [referee]
• Hong Zhou. Promotion Goethe-Universität Frankfurt 2011. Title of dissertation: Laws and Skills - An Inferential Diagnosis and Defense. [first opinion]
• Daniel Gutzmann. Promotion Goethe-Universität Frankfurt 2013. Title of dissertation: Use-conditional Meaning. Studies in Multidimensional Semantics. [first opinion]
• Viola Schmitt. Promotion Universität Wien 2013. Title of dissertation: More Pluralities. [second opinion]
• Andrew Withy. Promotion University of Auckland (NZ) 2014. Titel der Dissertation: Assertibility and Disjunction [external referee]
• Edgar Onea. Habilitation Universität Göttingen 2014. Title of habilitation dissertation: Potential Questions in Discourse and Grammar. [external referee]
• Hanna de Vries. Promotion Universität Utrecht 2015. Title of dissertation: Shifting Sets, Hidden Atoms: the semantics of distributivity, plurality and animacy. [external referee]
• Dominik Kauss. Promotion Goethe-Universität Frankfurt 2015. Title of dissertation: Conceivability, Existence, and Logic. [third opinion]
• Manuel Križ. Promotion Universität Wien 2015. Title of dissertation: Aspects of Homogeneity in the Semantics of Natural Language. [second supervisor]
• Dolf Rami. Habilitation Universität Göttingen 2015. Titel der Habilitationsschrift: Names in Context. [external referee]
• Corinna Trabandt. Promotion Goethe-Universität Frankfurt 2016. Title of dissertation: On the acquisition of restrictive and appositive relative clauses. [Zweitgutachter] L
• Jerra Busch. Promotion Goethe-Universität Frankfurt 2016. Title of dissertation: Anankastic Relatives. [Erstgutachter] L
• Ali Esmi. Promotion Goethe-Universität Frankfurt 2018. Title of dissertation: Knowability, Possible Knowledge, and the Church-Fitch Paradox. [Zweitgutachter] P
• Daniel Gutzmann. Habilitation Universität zu Köln 2018. Title of habilitation dissertation: The Grammar of Expressivity. [auswärtiger Gutachter] L
• Jan Köpping. Promotion Goethe-Universität Frankfurt 2019. Title of dissertation: The individual parameter. [Erstgutachter] L
• Merle Weicker. Promotion Goethe-Universität Frankfurt 2019. Title of dissertation: The Role of Semantic Complexity for the Acquisition of Adjectives. [Zweitgutachter] L
• David Lahm. Promotion Goethe-Universität Frankfurt 2020. Title of dissertation: Explorations in non-lexical semantics. [Zweitgutachter] L

c) Reviews for science foundations:

• Alexander von Humboldt-Stiftung (Bonn)
• Bundesministerium für Bildung und Forschung (Bonn)
• Deutsche Forschungsgemeinschaft (Bonn)
• Economic and Social Research Council (Swindon, UK)
• European Research Council (Brüssel)
• FWF - Fonds zur Förderung der wissenschaftlichen Forschung (Wien)
• GIF - German-Israeli Foundation for Scientific Research and Development (Jerusalem, Israel)
• National Science Foundation (Arlington, Virginia, USA)
• Nederlandse Organisatie voor Wetenschappelijk Onderzoek (Den Haag, NL)
• OTKA - Hungarian Scientific Research Fund (Budapest, HU)