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Perkins is on the board of directors of the Navajo Language Academy, under the auspices of which she is currently collaborating with Theodore B. Fernald on the Navajo Grammar Project, which aims to produce a reference grammar of the Navajo Language.
Sioux is a Siouan language spoken by over 30,000 Sioux in the United States and Canada, making it the fifth most spoken indigenous language in the United States or Canada, behind Navajo, Cree, Inuit and Ojibwe.
He served at the Franciscan mission to the Navajo at St. Michaels, Arizona, and at other missions in the Southwest, from 1901 to 1954, where he developed an interest in Navajo language and culture.