This edited collection presents two sets of interdisciplinary conversations connecting theoretical, methodological, and ideological issues in the study of language. In the first section, Approaches to the study of the indigenous languages of the Americas, the authors connect historical, theoretical, and documentary linguistics to examine the crucial role of endangered language data for the development of biopsychological theory and to highlight how methodological decisions impact language revitalization efforts. Section two, Approaches to the study of voices and ideologies, connects anthropological and documentary linguistics to examine how discourses of language contact, endangerment, linguistic purism and racism shape scholarly practice and language policy and to underscore the need for linguists and laypersons alike to acquire the analytical tools to deconstruct discourses of inequality. Together, these chapters pay homage to the scholarship of Jane H. Hill, demonstrating how a critical, interdisciplinary linguistics narrows the gap between disparate fields of analysis to treat the ecology of language in its entirety.