 In 1971 he founded REFORMA, the National Association to Promote Library and Information Services to Latinos and the Spanish-speaking, which is today a prominent organization for Latino librarians as well as for librarians serving Latino communities.Trejo was inspired to start REFORMA after a screening of the film "I Am Joaquin", based on the epic poem of the same title, by Corky Gonzalez and exploring the struggles and exploitation of Mexican Americans.He served as president of the organization from 1971 to 1974.