This is a brief report of a qualitative study of health sciences liaison librarians geared towards understanding how they learn the content in their schools. The overarching research question I sought to answer was, "How do health science liaison librarians acquire knowledge and expertise in their content field?" The study also answers three sub questions: (1) What factors are helpful in learning the concepts and how to communicate effectively with the different professionals in their assigned schools; (2) How does a librarian’s undergraduate education, professional development and other previous training help in the acquisition of knowledge; and (3) How does the environment in the schools or their relationships with the professionals in their schools influence their knowledge acquisition and expertise?...