This essay examines the professions of teachers and school librarians from the perspective of the teacher. Through a case study, teachers have been interviewed regarding their views on their collaboration with the school librarian and what they think the school librarian with his or her professional competence complements their students' teaching with. Theoretical framework is Lena Folkesson's dimensions for the interplay of profession, power and legitimacy. Teachers are chosen to participate because their school librarian has been awarded the prize "World-class school library". The respondents´ answers are compared to research studies on collaboration between professions and what the professional profession of librarian can contribute to students' education based on their professional competence.