 Texistepec Popoluca has been documented primarily in work by Søren Wichmann, a Danish anthropological and historical linguist and Ehren Reilly, a former graduate student at Johns Hopkins University.Reilly's work was a part of the larger Project for the Documentation of the Languages of Mesoamerica, under the leadership of the University of Pittsburgh's Terrence Kaufman, and contributed to Kaufman's project of deciphering Epi-Olmec writing.Less than 100 native speakers of Texistepec Popoluca remained when Søren Wichmann, Ehren Reilly, and Terrence Kaufman conducted their research between 1990 and 2002, and the language was moribund, with no new speakers acquiring the language natively, due to the prevalence of Spanish.