Sanger's first position at the Library was in the
Photoarchive, but she later transferred to Public Services. She was appointed the Chief Librarian of the Library in 1978, taking over the position from
Mildred Steinbach. Sanger contributed to and edited Katharine McCook Knox's
The Story of the Frick Art Reference Library: The Early Years, which was published in 1979, and in 1981, she established the Library's Conservation Department. After the death of the Library's founder
Helen Clay Frick in 1984, Sanger oversaw the merger of the Library with
The Frick Collection. She also managed "The Spanish Project," the Library's response to the United States government's general request to American research institutions to initiate "major international projects" that would strengthen ties between the United States and Spain in preparation for the Columbian Quincentenary in 1992. The project initiated by the Library had three aims, all of which were supervised by Sanger: to complete an annotated checklist of more than 7,000 Spanish artists active between the fourth and twentieth centuries; to hone the skills of graduate students from Spain and the United States in art-historical research and introduce them to database creation; and to augment considerably the Photoarchive's holdings in Spanish art. Sanger retired in 1994, although she continued to volunteer at the Library for the next several years. ==Family==