Arnulfo D. Trejo, professor of library science at the University of Arizona, is the author of Diccionario etimológico latinoamericano del léxico de la delincuencia and Bibliografía Chicana: A Guide to Information Sources. He also edited the first Quién es Quién: A Who’s Who of Spanish Heritage Librarians in the United States. He received an M.A. in Spanish language and literature from the Universidad de las Américas, Mexico; an M.A. in Library Science from Kent State University, and a Ph.D. from the Universidad Nacional Autónoma de México, Mexico. He was born in Durango, Mexico, in 1922, and grew up in Tucson, Arizona. He has published articles in both English and Spanish in various professional journals.