At Cornell, Barreiro was founding editor of Native Americas Journal (1995–2002). In 2003-2006, he redesigned and was Senior editor of Indian Country Today. He is also the editor of Indian Roots of American Democracy," (1988), and the Cornell Akwe:kon series that included "Indian Corn of the Americas: Gift to the World," (1988) and "Chiapas: Challenging History," (1994). A book published in Cuba in 2001, the ethnographical testimony Panchito: Mountain Cacique, (Ediciones Catedral, Santiago de Cuba) is the first modern ethnography of a contemporary Taino-Guajiro community, and its leader. Barreiro's first novel, published in 1993 (republished 2012, Fulcrum Publishers) Taino: the Indian Chronicles, is presented as a pseudo-journal of the life of historical Diego Colon, a 12-year-old Taino whom Christopher Columbus takes with him to Spain in 1493, and who later returns to the Americas, where he supports the Taino resistance led by Guarocuya. A 2006 book of journalistic essays, America is Indian Country, based on editorials and commentaties from the publication, Indian Country Today, canvasses contemporary issues and personalities in Indian Country. Barreiro most recently edited the book, Thinking in Indian: A John Mohawk Reader," (Fulcrum, 2010).