The vast majority of opportunities for information professionals are only open to those who hold a Master's degree from ALA-accredited schools. Check out those institutions here.
This document defines the basic knowledge to be possessed by all persons graduating
from an ALA-accredited master’s program in library and information studies.
A government report puts librarians at an increased need by 2030, projecting that librarians, information professionals, curators, and archivists will experience incredibly increased demand (#9 out of 700+ fields).
Special librarians work in specialized fields, often corporate fields, such as news, business, health sciences, etc. These individuals often do not have the title librarian.