This introduction establishes the volume’s focus on 35 individuals’ longitudinal development of languaging and ideologies during generational language shift in Catalonia characterized by localization and globalization. Vann explains the book’s emphasis on registering evolving ways of speaking and ideologies toward Catalan and Spanish language, identity, and nationalism, locating the book’s unique contributions within an extended-format language documentation. In relation to locals “doing being Catalan” in 1995 and 2017 (months before Catalonia’s ill-fated independence proclamation), Vann details documenting contemporary community ecologies via the sociology of language, the ethnography of speaking, and variationist sociolinguistics. Key aspects of such ecologies include shared translocalizing language ideological experiences, variable states of lexical meaning, patterned ways of speaking, discursively constructed sociocultural realities, and fluid ideologies toward language, identity, and nationalism.