Mahasin Abuwi Aleem is a library services manager for Contra Costa County Library. Before working for Contra Costa County Library, she was employed by Oakland Public Library (OPL) and served as OPL's Collection Management Librarian for Children's Services. She is co-founder of Hijabilibrarians.com, a collective of Muslim librarians who evaluate books that feature Muslim protagonists and Islamic-themed content. She has written book reviews for Kirkus, School Library Journal, and Horn Book's Calling Caldecott Blog. She has also served as an authenticity and sensitivity reader from several publishers and as a presenter and course advisor for Library Journal's Building Diverse Collections course. Mahasin was a member of the American Library Association's Coretta Scott King Book Awards Jury from 2021 - 2023.