Research

Language variation and change

Varieties of German, diachronic stages of the German language, structure and dynamics of the standard dialect axis, developmental trajectories of dialects and the standard language
Systemic-functional linguistics

Phonology and phonotactics, morphology and morphopragmatics, grammar in general and grammaticalization in particular
Sociolinguistics

Language and cultural identity, linguistic perception and attitudinal research, linguistic norms
Spatial structures

Areal typology, language contact, dialect classification
Corpora

Quantitative linguistics, geostatistics, corpus linguistics
History of science

Linguistics of the 19th century, historical linguistic cartography