To strengthen international research connections, to teach specialised topics, and to increase exposure to significant international research themes, each department will every year appoint one or more BFS/TFS Guest professors. These will have stays at the departments of a minimum of two weeks and up to a maximum of three months. During this time they will teach a mini-course on a specific topic, or possibly a more extensive course if the stay is six weeks or more. They may also contribute to supervision of master and Ph.D. students. Deadlines: 1 March and 1 Oct, for activities the following two semesters