In 2001, he founded the Orfeón San Juan Bautista, a secular professional choral group where he serves as co-director. As an arranger and composer, his work primarily consists of a cappella choral pieces. He has also written art songs, film music, chamber music for choir with instrumental accompaniment, symphonic-choral music, ballet, opera, and a cappella choral adaptations of popular and Ibero-American folk music. His works have been performed in Spain, Italy, France, Venezuela, Colombia, Mexico, Cuba, the Dominican Republic, Canada, the United States, Austria, and Turkey. Other international collaborations include commissions or projects with the Vassar College Women’s Chorale (USA), Exaudi (Cuba), Seraphic Fire (USA), the Choir of the Central University of Venezuela, The Elm City Girls’ Choir (USA), Soli-Tutti (France), Yale Alumni Chorus (USA), and Boğaziçi Jazz Choir (Turkey). In Puerto Rico, the leading national choirs have sung his arrangements and frequently commission music from him.

Guarionex Morales Matos holds a bachelor’s degree in Public Communication and a Master’s in Cultural Management and Administration, both awarded by the University of Puerto Rico at Río Piedras. His notable publications include: Entre la canción de arte y el folclor: música infantil puertorriqueña (Riel, 2021), Orfeón San Juan Bautista: quince años de absoluta armonía 2001-2016 (OSJB, 2017), Música popular puertorriqueña: adaptaciones corales (Instituto de Cultura Puertorriqueña, 2015) y Composiciones corales originales (1994-2014) (Instituto de Cultura Puertorriqueña, 2015).