first time in her career that she undertook such a heavy ordered challenge with steadfast determination. Mann's interests started to expand beyond library science as she began to hone her teaching skills as a senior instructor at the University of Illinois. From there, she accepted a position as head of the Cataloging Department at the Carnegie Library in Pittsburgh. Her work there created quite a reputation for her career; her particular talent for both supervising and classifying in ostensibly "insurmountable difficulties was and remains, one of the finest of its kind". After many years at the Carnegie Library, she was offered a position at the Engineering Societies Library in New York City. This probably posed quite a challenge for her since she had previously never catered to that kind of library patron; however, she did not disappoint. In 1924, she went to the American Library Association School in Paris, France to teach cataloging and classification courses. She has been described as " the best teacher of these subjects found anywhere". Her time in Paris proved that her talents extended beyond cataloging and librarianship, as she was even a highly effective and skilled educator. It is not surprising then that she was extended an invitation to join the faculty at the University of Michigan in 1926. Mann was one of three full-time professors hired at the department's inception. Her years there were described as "grand and good". During her time at the University of Michigan Mann wrote prolifically on a broad selection of topics ranging from: "the techniques and components of cataloging to such diverse topics as research and reference in the special library, the future of cataloging, the teaching of cataloging and classification, and personal interests in government publications, subject analysis, and children's literature". She authored several textbooks including Introduction to Cataloging and Classification of Books in 1930 and Subject Headings for Use in Dictionary Catalogs of Juvenile Books. The former was recognized as the primary teaching text almost "before it was published and remains, even today, a major guide to the principles of cataloging and classification.". Public service was at the heart of her philosophy of librarianship, "Here one turns his attention, not to gratifying his own hunger for literature, but to the far broader task of studying, recording, and interpreting books so that they may reach the thousands of readers who are in search of reading matter of