 Edward and Becky learned the Seri language and did the first scientific analysis of its phonology, morphology and grammar.A major collaborator with them on their work at that time was Roberto Herrera Marcos, a Seri man who also resided in Haxöl Iihom.Their earliest publications were Seri reading primers that were published by SIL in cooperation with the Secretaría de Educación Pública after developing the first alphabet for the language under the guidelines of that Mexican ministry.