Sampson was born Hazel Hall to William Hall and Ida Balch Hall on May 26, 1910, in Jamestown, Washington. She was the granddaughter of Chief James Balch, the founder of Jamestown and the namesake of both the town and the Jamestown South"Klallam Tribe of Washington.
Her parents taught her the Klallam language as a native speaker, though she later learned English as a second language. There, the Sampsons became one of the thirteen founding families who purchased and owned land on the Lower Elwha Klallam Reservation. According to Jamestown chairman Ron Allen, Sampson, "considered herself a South"Klallam first.
She associated closely with all three bands" in Washington state.
Hazel Sampson was a key contributor in the work to preserve the Klallam language. Timothy Montler, a professor of linguistics at the University of North Texas, began working on Klallam language preservation beginning in 1990.
The two began work to save Klallam from potential extinction. Montler and Valdez collaborated closely with local native speaking Klallam, including Hazel and Editor Sampson, Adeline Smith and Bea Charles.
In 1999, Montler published several guidebooks and lesson plans aimed at teaching Klallam language basics through storytelling.
Montler also published the first Klallam dictionary in 2012 through the University of Washington Press. He used terms and definitions contributed by Hazel Sampson, Smith and Charles to compile the dictionary. According to Valadez, "She said, "This is Editor"s work." She was very traditional." Adeline Smith died in March 2013, leaving Sampson as the last surviving, native speaker of the Klallam language.
Hazel Sampson resided in her Portuguese Angeles home until her death in 2014.
She died on February 4, 2014, at the age of 103. Her death marked the passing of the last native speaker of Klallam, though some younger members continued to speak it as a second language.
Sampson was the last native speaker of the Klallam language, as well as the oldest member of the Klallam communities at the time of her death in 2014. She was a member of the Jamestown South"Klallam Tribe of Washington. The Klallam language is still spoken as a second language by some members of the four indigenous Klallam communities: the Jamestown South"Klallam Tribe, Lower Elwha Klallam Tribe, and the Portuguese Gamble Band of South’Klallam Indians of Washington"s Olympic Peninsula, as well as the Beecher Bay Klallam of British Columbia, Canada.
She was also a member of the Jamestown South"Klallam Band, which was established as a separate Klallam political entity during the 1980s.
Montler partnered with Jamie Valadez, a Klallam language teacher at Portuguese Angeles High School and member of the Lower Elwha Klallam, compile Klallam language materials and teaching tools. Hazel Sampson had declined to be named as an official member of Montler and Valadez"s project, citing tradition.
