After graduation, he painted and taught art in the American Southwest. He was the chair of Navajo Community College's Art Department from 1976 to 1978. In 1978, he took a position as a lecturer at University of Great Falls in Montana. He was appointed by the governor to the Alaska State Council on the Arts in 1981. He received a position at the University of Alaska in 1984, and the Visual Arts Center of Alaska in 1989. In 1992 he took a position as director of the Native Art Center of the University of Alaska in Fairbanks, Alaska. Amason has created paintings for Anchorage International Airport and the U.S. Federal Courthouse Building in Anchorage, as well as public schools in Alaska.