Royal Belgian Institute of natural Sciences

Dept. Paleobiology, National Museum of Natural History, Smithsonian Institution

Professor at Faculty of Earth Sciences, University of Iceland

Director, Bennelongia

Full Professor of Palaeontology, University Roma Tre

Dept. Invertebrate Zoology, National Museum of Natural History, Smithsonian Institution

Privatdozent für Geologie und Paläontologie, Universität Jena

Cavanilles Inst. of Biodiversity & Evol. Biol., University of Valencia (ROR: 043nxc105)

National Natural History Museum of Luxembourg, Research associate

Professor de Zoologia, Universidade de São Paulo