Xiomara Astrid Michaelsen was a Starfleet officer on active duty during at least the late 23rd century.

Both of Michaelsen's parents were tenth-generation Texans — her father predominantly of Scandinavian ancestry and her mother predominantly of Chinese ancestry — and professors at University of Texas at Austin.

She was born in Austin, Texas, on 22 June 2268.

Michaelsen was a mathematics specialist aboard USS Avenger, but transferred to USS Blackheart in March, 2293. Her successor on Avenger was Caitlin Rutherford. (Star Trek: Avenger: "Belonging", "A Visit to the Physical Science Chief's Office")

At some point, Michaelsen also served aboard USS Denpasar.

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