Birger Hjørland started working at the RSLIS in 1976, then became a research librarian at The Royal Library in Copenhagen from 1978 to 1990. From 1990 he returned to RSLIS and became professor in 2001. He has done research and taught at RSLIS ever since. Many of his students have become research librarians or information specialists. He is a member of the editorial board of various journals and the editor-in-chief of the ''ISKO Encyclopedia of Knowledge Organization''.