Albert White Hat, who was instrumental in teaching and preserving the endangered Lakota American Indian language and translated the Hollywood movie “Dances With Wolves” into Lakota for its actors, died June 11 at a South Dakota hospital. He was 74.

He had prostate cancer, according to family and friends.

Mr. White Hat, a member of the Rosebud Sioux Tribe, wrote several books about Lakota, a language fluently spoken by fewer than 6,000 people. The average age of those speakers is 60, and less than 14 percent of the Lakota population in South Dakota and North Dakota — where the vast majority of Lakota speakers live — speak their native tongue.

The first native Lakota speaker to publish a Lakota textbook and glossary, Mr. White Hat was considered an activist for traditional ways of living, according to his daughter, Emily White Hat. He created an orthography for the language, which he had taught since 1975, and was head of the Lakota Studies Department at Sinte Gleska University on the Rosebud Indian Reservation.

Emily White Hat said her father believed in sharing the Lakota way of life with both tribal members and non-Native Americans.

He believed “there was always an opportunity to educate,” she said. “Even though some questions may be off the wall, he believed it was better to take the opportunity than to be misled about who we are.”

One of those opportunities came when Mr. White Hat provided the translation for the Lakota dialogue in the 1990 film “Dances With Wolves.”

Wilhelm Meya, executive director of the Lakota Language Consortium, a nonprofit organization seeking to revitalize the Lakota language, called Mr. White Hat a “warrior” for the language. Meya said he hopes that Mr. White Hat’s legacy will live on and that more young people will decide to study the language and work to retain its importance.

“We are, after all, losing speakers every year,” he said. “Over 100 Lakota speakers pass on [each year]. Those speakers are not being replaced by young speakers. Until we can reverse that trend, the language will continue to be very much in danger.”

Albert White Hat was born on the outskirts of St. Francis, S.D., on the Rosebud Reservation. He spoke only Lakota until his teens, when he started learning English in school. His grandfather, Chief Hollow Horn Bear, was a leading chief in many of the Plains Indian Wars against settlers in the 1800s and was involved in treaty negotiations with the United States.

Rosebud Sioux Tribal President Cyril Scott called Mr. White Hat a great teacher, spiritual leader and friend. He noted that Mr. White Hat was known all over the powwow circuit and was awarded numerous honors for his dedication to preserving the Lakota language and culture.

“He did so much research and knowledge of the Lakota language itself that those of who are young, who are learning to teach the Lakota language, he encouraged all of us,” added Tina Martinez, co-chairwoman of the Lakota Studies Department at Sinte Gleska University. “And yet his loss is all our loss. We don’t have that source to go to anymore.”

Mr. White Hat’s survivors include by his wife seven children and many grandchildren.

— Associated Press