Spears has been in the spotlight since age ten, starting with his first role in TNT's production of Geronimo, which was shot in Arizona. Most recently, Spears made a cameo in Episode 1 of the final season of Longmire. He also voiced the character of tribal elder Grey Beaver in the 2018 animated film, White Fang. Spears played the popular Joseph Black Moon from Season 1 to Season 2 of AMC's television series, Hell On Wheels. Spears has said his most rewarding role to date was Shane Chasing Horse in the film Dreamkeeper. When cast for the lead in the 2004 film Black Cloud, he trained for three months with boxing trainer Jimmy Gambia to perfect his boxing skills before filming started. The film is about a Navajo boxer training for the Golden Gloves with the promise of a spot at the Olympics while struggling with the secrets of his family's past. One of the scenes was filmed in Las Vegas during the 2003 Golden Gloves National Championship.
Other work
In 2005, Spears and his brother Michael modeled for Cochiti Pueblo fashion designer Virgil Ortiz for his "Indigene" clothing line, and were featured on the cover of the August 2005 issue of New Mexico Magazine.
FAITA Best Actor Award in 2004 for Hallmark Entertainment's miniseries Dreamkeeper.
Phoenix Film Festival Best Actor Award in 2004 for his lead role in Black Cloud.
Personal life
Spears co-hosted the 39th Annual American Indian Film Institute Awards this November along with actress Tonantzin Carmelo. Spears attended and was a mentor at the 2nd annual HatcH Audiovisual Festival in Bozeman, Montana in October 2005. HatcH is a film and arts festival whose mission is to provide mentorship, education, inspiration, and recognition to the next generation of creative innovators. Spears and his brother Michael have also been active with Native Wind and the COUP Native Energy, of which their father Patrick Spears was formerly president. COUP was formed in 1994 to provide a forum for utility issues discussion from regulatory and economic perspectives. Spears speaks some Lakota. He is an avid outdoorsman with hunting, fishing, archery and rodeo experience, and is a Traditional and Grass dancer. He also travels nationally as a keynote speaker. He currently resides in Montana.