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José Elías-Ulloa is a formal linguist, whose specialization is phonology. His main interests are the study of prosody (syllable weight, metrical stress, intonation) and the interaction with segmental phenomena. In particular, he studies the prosody of indigenous languages in contact with Latin American Spanish as well as the varieties of Spanish that emerge from that contact. He has conducted several fieldtrips in Peru, and research on the Amazonian languages spoken there.