Nathan Lee Chasing His Horse, aka Nathan Chasing Horse and Nathan Chases His Horse (born April 28, 1976) is a Native American actor. Formerly from the Rosebud Lakota Sioux Nation, he has spent most of his adult life in California, and now lives in Las Vegas, NV.Chasing Horse is perhaps best known for his portrayal of the young Lakota character, Smiles A Lot (Lakota: Iȟá s’a) in Kevin Costner's 1990 movie Dances with Wolves. He has appeared in three TNT telefilms with First Nations actor Eric Schweig: The Broken Chain, Into the West and Bury My Heart at Wounded Knee. Later, he went on to give speaking engagements and workshops on spirituality, and developed a following in a variety of locations.On July 6, 2015, after attempting to hold a Sun Dance ceremony in the area, Chasing Horse was banned from the Fort Peck Indian Reservation in Montana as a "safety threat", due to charges of "human trafficking, drug dealing, spiritual abuse and intimidation of tribal members."