Main fields of research are brachiopods and stratigraphy. Main goals are biostratigraphical subdivisions of sedimentary successions and correlation by means of brachiopods.
Sedimentology and facies are also studied in order to reconstruct the palaeoenvironments of the brachiopods. The combination of the brachiopod stratigraphy with pelagic stratigraphies, especially conodont and dacryoconarid stratigraphies, allow the correlation of neritic and pelagic subdivisions. Studies on constructional and functional morphology of Devonian brachiopods are getting more important to understand their life habits and evolution.
At present the studies are concentrated on:
- systematic study of Devonian brachiopods from the Anti-Atlas, Morocco
- revision of Lower Devonian brachiopods from the Rhenish Slate Mountains
- constructional and functional morphology, palaeobiology, and palaeoecology of Devonian brachiopods
- morphology, phylogeny und taxonomy of the Lower and Middle Devonian Delthyridoidea (Spiriferida) , worldwide
- reconstruction of the depositional environment of the siliciclastic Lower Devonian of the Rhenish Slate Mountains
- brachiopods of the Emsquarzit (lower Upper Emsian) in the Rhenish Slate Mountains
- Upper Siegenian brachiopods from Aegidienberg (Siebengebirge, Rhenish Slate Mountains)
- systematics, stratigraphy, and palaeobiogeography of Middle and Upper Devonian brachiopods from the Western Sahara (Morocco)
- Devonian brachiopods from South China, comparison with European genera
- Lower and Middle Devonian brachiopod stratigraphy
- subdivision of the Emsian stage
- brachiopods of the Ordovician Andreasteich Quarzite near Giessen (Germany)