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and several US universities. His research has focused on diglossia, bilingualism, and sociolinguistic methodology. He has published a grammar of Quechua and directed a study on Quechua-Spanish bilingualism in Peru. He introduced, together with colleagues, the notions of "ethnolect" and "community profiling" in the field of sociolinguistics.doi:10.15443/rl2714 fatcat:uyvrsjoxdvdoxbz5nr552klnfi