HALS, Helsinki Diversity Linguistics Group, is a multidisciplinary research community that brings together people working on linguistic diversity from different perspectives: areal, typological, historical, and societal. HALS research takes both local and global perspectives. Linguistic fieldwork, conducted in collaboration with speakers and communities across the world, forms the core of HALS research activities. This fieldwork complements and informs our large-scale typological comparative work on linguistic diversity. HALS organizes collective field trips that give students real-life fieldwork experience. The viability and well-being of linguistic communities is a central concern for HALS, and many of its members work to support communities in revitalizing and maintaining their languages and cultures. HALS also organizes seminars and workshops that support research on linguistic diversity.