The focus of my professional work: Fossil vertebrates (mainly mammals and birds, especially Pleistocene and their systematice. Intraspecific changes and their use for stratigraphy. The evolution of species and the changesof the communities during the Pleistocene in relation to changes in the environment and time. Biostratigrafical and ekostratigrafical problems. Tafonomie and biostratonomie. The extinction of the Pleistocene. The first traces of domestication. Systematics and evolution of the genus Equus and the genus Ursus. Paleoekological and paleobiological problems. Genotypical changes and the changes unleashed by the environment. Patterns of evolution. Quaternary Geology (mainly loess and river terraces, their stratigraphic classification). The stratigraphy of the Pleistocene. The cave sediments, fluvial sediments, loess and fossil soils. Spelaeoloy. History of Science (especially the history of Geological Sciences) and the methodology of science.