Antônio Roberto Monteiro Simões is a Brazilian-born linguist interested in the phonetics and phonology of the Romance languages. Simões is an associate professor of Spanish and Portuguese linguistics at the University of Kansas, in Lawrence, USA, where he teaches Hispanic linguistics. He has authored books, textbooks and articles contrasting the Portuguese and Spanish languages. Simões is currently conducting research work on speech models and foreign language learning models, especially in relation to phonetics and phonology. Simões work on modeling is a continuation of his Ph.D. thesis; an adaptation of the late Dennis Klatt's 1976 pioneering model to predict duration in connected speech.