Prof. Lindsey’s research has both theoretical and documentary applications. Her theoretical work focuses on the analysis of underspecification and variation in phonological systems supported primarily by field data from underdocumented/understudied languages. Her dissertation utilized original data from eleven months of fieldwork with Ende speakers of Limol village, Papua New Guinea to explore the interaction of so-called ghost elements pervasive in Ende phonology. Current research projects include extended fieldwork in the South Fly area of Papua New Guinea to support the first reference grammar of Ende, a typological study of the Pahoturi River language family, and theoretical analyses of vowel harmony and phonological reduplication.