During recent years the professional role of librarians has changed considerably. Development in the areas of information technology and the Internet has had a strong impact on libraries. Today’s visitors are in greater need of librarian support for information seeking and other services. This has led to a shift towards the development of a more complex pedagogical role for librarians. The aim of this Master thesis is to analyse the pedagogic and professional role of librarians, and of the nature of co-operation between librarians and teachers. Our research is based on interviews with librarians at a University library and with teachers. The interviews were analysed through a qualitative, thematic approach. The most important conclusions of our research are that librarians are very motivated to work together with the teachers and that they use every opportunity to do so. The teachers need librarians’ knowledge about sources, methods and search strategies to be able to carry out relevant information seeking tasks in a class. Findings indicate that some of those tasks might have been impossible for the teachers to assist their students with without the co-operation of a librarian. Teachers and librarians have several forums where they can interact. One example is the library’s reference group. As a result new forms of cooperation have evolved.