This is a timeline of women in library science in the United States.
1911: Theresa Elmendorf became the first woman elected president of the American Library Association.
1923: Virginia Proctor Powell Florence became the first black woman in the United States to earn a degree in library science. She earned the degree (Bachelor of Library Science) from what is now part of the University of Pittsburgh.
1972: Zoia Horn, born in Ukraine, became the first United States librarian to be jailed for refusing to share information as a matter of conscience (and, as she was female, the first female United States librarian to do so.)
1973: Page Ackerman became University Librarian for the University of California, Los Angeles, and was the United States's first female librarian of a system as large and complex as UCLA's.
2016: Carla Hayden became the first female Librarian of Congress.