[3] He has authored, co-authored, and edited research articles and books including Prolific Domains: On the Anti-locality of Movement Dependencies, InterPhases: Phase-Theoretic Investigations of Linguistic Interfaces, The Cambridge Handbook of Biolinguistics, and the textbook Understanding Minimalism.
[7] In 2010, he co-founded the Linguistic Society of America (LSA) Special Interest Group for Biolinguistics and has been serving as the Director of the Cyprus Acquisition Team (CAT Lab) since its foundation in 2008.
[2] Grohmann has contributed to the field of linguistics by studying the syntax, semantics, and pragmatics of Wh-question formation, pronominal grammar, morpho-syntax, movement diagnostics, clause structure, non-finiteness, computation, predication, and related topics.
He also published a textbook, Understanding Minimalism alongside Norbert Hornstein and Jairo Nunesa, which introduces minimalist grammar, contrasting it with Government and Binding analyses.
[10] With Maria Kambanaros, Evelina Leivada, Natalia Pavlou, Charley Rowe, and other students, postdocs, and colleagues from the CAT Lab, he explored language development in Cypriot Greek, introducing "bi-x" with emphasis on "(discrete) bilectalism" and the Socio-Syntax of Development Hypothesis to understand the connection between biolinguistic implications and clitic placement acquisition.
In a 2014 study with Marina Varnava, he investigated how Cypriot Greek-speaking children aged 4 to 9 acquire the interpretation of wh-questions, revealing developmental discrepancies in a diglossic environment.
[13] Additionally, they examined the language performance of a child with 22q11 deletion syndrome at ages 6 and 10, revealing improved morphosyntactic abilities over time but no changes in nonverbal IQ or vocabulary.