During most of his career, Buechel served as an itinerant missionary who lived among the Lakota and frequently stayed in the homes of Lakota parishioners. At various times he also served as the superintendent of the
St. Francis Mission school,
Rosebud Reservation, and the
Holy Rosary Mission school (now
Red Cloud High School and Red Cloud Grade School),
Pine Ridge Reservation. On both reservations
Wanbli Sapa (Black Eagle), as he was called, collaborated closely with native catechists, among them Nicholas
Black Elk (of
Black Elk Speaks). Buechel was dedicated to converting the Lakota to Christianity and transforming their lives. But also he was dedicated to preserving their Lakota language and cultural heritage. Already during his first stay at
St. Francis (1902–1904) Buechel wrote down stories of the Lakota. In collaboration with
Ivan Stars and other Lakota catechists, Buechel collected oral histories, now published bilingually, and cultural objects with related information, now preserved at the
Buechel Memorial Lakota Museum,
St. Francis, South Dakota, and first displayed at the Mission in 1921. With the
Sicangu Lakota, he also collected names of plants and their use and he took photographs of the people on the reservations to document their lives. Between 1902 and 1954, he compiled over 24,000 Lakota (and Dakota) word entries on slips of paper for a bilingual dictionary of the
Lakota language, which included approximately 18,000 from the work of
Stephen Return Riggs, several thousand from his conversations with native people, and a few from the works of
Emil Perrig, S.J., and Lakota anthropologist
Ella Cara Deloria. In 1924, Buechel published his first notable work in Lakota, his Bible History, which included a selection of texts modeled after the German
Biblische Geschichte. In 1927 the Jesuit missionaries, with Buechel playing a major role, published
Sursum Corda, a Lakota-language book of prayers and hymns, and in 1939, Buechel published his main work,
A Grammar of Lakota. Meanwhile, he gained recognition as a linguist through his correspondence with anthropologists like
Franz Boas and Lakota
Ella Cara Deloria. Buechel was not able to finish his dictionary himself; it appeared in print long after his death, as did other books building upon his collections. In 1947, on the occasion of Buechel's 50th anniversary as a member of the Jesuit order,
Joseph Schwart (born Josef Schwärzler in Austria) a Jesuit religious brother, constructed a separate museum building for the ethnological collection. When Buechel died, it contained 661 objects, each with a name and description (most often in Lakota) written by him, and a catalogue number. During the following decades it grew to about 2,200 at present. Buechel's linguistic work today is recognized and used as one of the most important sources for the
Lakota language by all who want to learn it or have a general concern in its preservation and development. Many Lakota remember him as a man who respected their personal dignity and their traditional culture. Among the Jesuits today, he is increasingly perceived as a role model because of his respectful attitude towards the Lakota as a people and as individuals. ==Writings==