Public Librarians typically have an undergraduate degree in literature, science, the arts or other specialty followed by a masters degree in Library and Information Science from a university accredited by the American Library Association. They also have accumulated experience in their field through internships, working in the library or volunteer work. 

In the last decade or two, public librarians have reinvented the library into a community center. They not only have the traditional  books and multimedia collections, but have added programming, maker spaces, access to technology, services to home-schoolers, help for the homeless,  and services to various cultural groups in the community.

Duties include:

• Mentoring patrons of all types without regard to their own life choices.

• Assisting with patron research, technology, creating,  and other services benefiting all users.

• Discovering new resources that can be added to the library.

• Maintaining library collections and focusing on development based on the community's needs.

• Managing library budget and negotiating with vendors.  

• Training, supporting, and supervising library staff members. 

• Leading community outreach

School Librarians  often have a Masters in Library and Information Science. In most states, they are also required to have a teaching credential.  Their credential most often comes from a university accredited by the American Library Association.

Duties include:

• Partnering with classroom teachers in the construction, teaching, and assessment of deep learning experiences.

• Embedding the best technology  in learning experiences that maximize learning and creativity.

• Providing equitable access to information and technology for every child and teen.

• creating a space where student experience safety, mentoring, making, and caring whether as individuals, small groups, or large groups using the flexible environment they need any time during the day. 

• Building quality collections of books, digital and multimedia formats that help learners, parents, and teachers accomplish educational goals.

• Managing the library as a place not only to consume knowledge but also to create knowledge. The space may be called the library or a learning commons. 

• Managing the budget for the library and consulting with parents and staff on the best books and other materials to add to the existing collection and curriculum

• Continuing professional learning development through conferences and collaboration with other librarians and community members.