As a library clerk, which is sometimes called a library assistant, your responsibilities are to assist librarians with duties like shelving books, help a library patron find reference materials and resources, answer questions or check out books at the circulation desk, and issue library cards. Library clerks also organize books and reference materials, answer phone calls, clean the library, set up rooms in the library for meetings, and plan or host special library events. Library clerks work under the supervision of a librarian and sometimes do so while they train for a future career as a librarian.