Anna Jordan Huff is an American multi-media artist, composer, producer and actress best known by her stage name Anna Oxygen. After starting her music career as a member of the Space Ballerinas, a synth-pop group then based in Olympia, she recorded her debut solo album All Your Faded Things (2003) with producer Justin Trosper, before releasing her second album This Is an Exercise (2006) on the Kill Rock Stars label. Her albums have featured guest vocalists such as Beth Ditto and Mirah.

Huff has appeared as a guest artist on recordings by groups such as the Microphones. Huff is also a member of Cloud Eye Control, a performance art group, and is a member of the psychedelic folk group Day/Moon. Her feature film debut as an actress was the 2005 film Police Beat, and she has written for a number of film soundtracks, including the three films This World Made Itself, Myth and Infrastructure, and Dreaming of Lucid Living, animated by Miwa Matreyek, and numerous short films by animator Maureen Selwood.

Since 2020, Huff has taught at Hamilton College. She had previously taught at the Cornell University College of Architecture, Art, and Planning and California Institute of the Arts' Center for Integrated Media.

Huff began her musical career in the late 1990s with the novelty synth-pop group the Space Ballerinas, based in Olympia. She handled vocals and keyboards, as well as helping write their original material. Making their debut as a trio at Ladyfest Olympia, the group released two EPs on Yoyo Records entitled "Diamonds" and "If Goth Was Pink" and opened a show for Peaches before disbanding in 2001. Also around this time she contributed to albums by local artists such as the Blow, Phil Elverum, Mirah, and Karl Blau.

Huff's solo career started in 2002 after she moved from Olympia to Seattle. She then recorded All Your Faded Things with producer Justin Trosper, which was released on Cold Crush Records (an affiliate of Dim Mak Records founded by Derek Fudesco of Murder City Devils and Steve Aoki) in 2003. MacKenzie Wilson of AllMusic termed the album synth-pop and commented on the "minimalist approach" of the production, stating "she adds a bit of sauce to the new-millennium electroclash stage and celebrates the delicious design of classic new wave."

Huff's feature film debut as an actress was in the 2005 film Police Beat, an American crime film written by Charles Mudede of The Stranger.

"This Is an Exercise [is] just as fascinating as it is chilly and alienating. In her songs, Oxygen explores some of the same issues of authenticity, creation, and consumption that Tracy + the Plastics do, but with a sci-fi/fantasy bent."

After releasing the single "45 Meet Jennifer", Huff released her second album This Is an Exercise on the Kill Rock Stars label on February 21, 2006. As Anna Oxygen, she composed the album herself, handling primary vocals and sequencing. It featured guest artists such as Kitty Jensen and Mirah Yom Tov Zeitlyn as vocalists. Portland artist Jona Bechtolt helped Huff with the cover art. With mostly original music, the album also includes a cover of "Willow's Song" by American composer Paul Giovanni The album was met with a largely positive reception. The Phoenix New Times wrote that Huff's vocal stylings were "a perfect contrast to the rhythmically ebullient programmed synths and beats supporting them—backdrops coursing, playful, robotic, and pop basic." In 2007, as Anna Oxygen, she contributed the song "Born to Shake" to the Play compilation released by DeSoto Records.