Known for his portraiture and portrayals of local ceremonies and customs, he has exhibited his work across the country. He was trained in the Studio style, and was initially interested in portraiture. An early success was his painting of his relatives Maria and
Julian Martinez. His later work often broke from the Studio style and showed influence of self-taught painters like
Fred Kabotie. His drawings often feature a number of figures, with apparel and features meticulously rendered. Atencio served as Governor of the San Ildefonso Pueblo in 1966 to 1967. He worked for some years as a medical illustrator. == Death and legacy ==