Ash-Milby attended Pacific Lutheran University and studied studio art before transferring to the University of Washington to study art history.[3] She graduated in 1991 with a bachelor's degree in art history.[3] During the summer after her junior year, she was an intern at the Metropolitan Museum of Art in New York City, an experience she credited with inspiring her to pursue a career in museums.[3] Ash-Milby received a master's degree in Native American art history from the University of New Mexico.[1]
In 2001 Ash-Milby began working at the American Indian Community House (AICH) Gallery, a New York nonprofit that provides services for Native people living in the city. Ash-Milby served as curator and co-director of the AICH Gallery alongside artist G. Peter Jemison. In 2005, Ash-Milby curated a solo show for the gallery by artist Jeffrey Gibson.[4]
National Museum of the American Indian
Ash-Milby returned to the NMAI's Heye Center in 2005, first as an assistant curator and eventually as an associate curator.[1]
While at NMAI, Ash-Milby organized a large number of exhibitions, including a solo show by Edgar Heap of Birds produced as a collateral exhibition for the 52nd Venice Biennale,[3] and solo shows at the museum by C. Maxx Stevens in 2012[1] and Kay WalkingStick in 2015.[5] She also produced several thematic exhibitions for the museum, including Off the Map: Landscape in the Native Imagination (2007); HIDE: Skin as Material and Metaphor (2010); and Transformer: Native Art in Light and Sound (2017).[1]
Ash-Milby's final exhibition for NMAI, a retrospective on artist Oscar Howe, opened after her departure.[2]
Portland Art Museum
In 2018 Ash-Milby was named Curator of Native American Art at the Portland Art Museum (PAM), where she began in 2019.[2]
Ash-Milby has overseen the repatriation of several objects, artifacts, and artworks from the museum's collection by Native makers that had been stolen or improperly purchased by their donors,[6] which she said was a priority in her time at the museum.[2]
In conjunction with the 60th Venice Biennale in 2024, Ash-Milby commissioned and co-curated artist Jeffrey Gibson's solo exhibition The Space in Which to Place Me for the American pavilion.[4] The exhibition, commissioned by the PAM and SITE Santa Fe, was the first solo exhibition by an Indigenous artist to represent the United States at the Biennale,[4] and Ash-Milby was the first Indigenous person to curate an exhibition for the American pavilion.[7]
Most Serene Republics: Edgar Heap of Birds (2009). By Kathleen Ash-Milby and Truman Lowe (eds.). Washington, D.C.: National Museum of the American Indian. ISBN9781933565125
Hide: Skin as Material and Metaphor (2010). By Kathleen Ash-Milby (ed.). Washington, D.C.: National Museum of the American Indian. ISBN9781933565156
Kay WalkingStick: An American Artist (2015). By Kathleen Ash-Milby and David W. Penney (eds.). Washington, D.C.: National Museum of the American Indian. ISBN9781588345103
Dakota Modern: The Art of Oscar Howe (2022). By Kathleen Ash-Milby and Bill Anthes (eds.). Washington, D.C.: National Museum of the American Indian. ISBN9781933565330
Chapters
"Landscape: Through an Interior View". By Kathleen Ash-Milby. In Duane Blue Spruce and Tanya Thrasher (eds.): The Land Has Memory: Indigenous Knowledge, Native Landscapes, and the National Museum of the American Indian (2008). Chapel Hill, North Carolina / Washington, D.C.: University of North Carolina Press / National Museum of the American Indian. ISBN9780807889787
"Alan Michelson: Landscapes of Loss and Presence". By Kathleen Ash-Milby. In Jennifer Complo McNutt and Ashley Holland (eds.): We Are Here!: The Eiteljorg Contemporary Art Fellowship 2011 (2011). Indianapolis / Seattle: Eiteljorg Museum / University of Washington Press. ISBN9780295991795
"Native Makers/New Media". By Kathleen Ash-Milby. In Erika Suderburg and Ming-Yuen S. Ma (eds.): Resolutions 3: Global Networks of Video (2012). Minneapolis: University of Minnesota Press. ISBN9780816670833
"Inclusivity or Sovereignty? Native American Arts in the Gallery and the Museum since 1992". By Kathleen Ash-Milby and Ruth B. Phillips (Summer 2017). Art Journal. 76 (2): 10–38. New York: College Art Association. OCLC1514294.
"Art That Moves". By Kathleen Ash-Milby (Fall 2017). American Indian. Vol. 18, no. 3. Washington, D.C.: National Museum of the American Indian. OCLC1313829604.