Andreas Ledl is subject librarian for psychology, philosophy and educational studies at the Basel University Library. He holds a graduate degree in educational science from University of Regensburg, a master degree in library and information science from Humboldt University of Berlin and a PhD from University of Flensburg. His research interests include knowledge organization, information literacy, subject indexing, open data, open access, and the Semantic Web. He is the initiator, technical head and manager of the Basel Register of Thesauri, Ontologies & Classifications (BARTOC.org).