Others
- Member of the editorial boards of the journals Thaiszia – Journal of Botany (1995–), Polish Botanical Journal (2000–), Biologia (Bratislava) (1995–1998)
- Member of the International Board of Organization for the Phyto-Taxonomic Investigation of the Mediterranean Area (2001–2007)
- Member of the Steering Committee of the project Euro+Med PlantBase (Flora Europaea successor) (1999–)
- Member of the Steering Committee & Editorial Committee of the project Species Plantarum– Flora of the World (IOPI project)(2000–)
- Member of the Committee for Biological and Ecological Sciences of the Grant Agency of the Ministry of Education of the Slovak Republic and the Slovak Academy of Sciences (1996–2002)
- Global Taxonomy Initiative – National focal point and member of the co-ordination mechanism for the Slovak Republic (2001–)
- Global Biodiversity Information Facility, person in charge of the national node for the Slovak Republic and member of the GBIF Governing Board (2001–)