Harper was a female Human who served as a Starfleet sciences division officer during the mid-23rd century.
During the Klingon War of 2256-57, she served as medical officer on J'Gal under Commander Buck Martinez.
During the final Battle of J'Gal, Klingon General Dak'Rah set his sights on the Mobile Combat Surgical Unit, where Harper was stationed, and she was with Nurse Christine Chapel when the unit took a direct hit to their power supply. Chapel grabbed the shaken Harper by her shoulders and asked her if she was good, leading Harper to reply, "No, no, I'm good, I'm good. Go, go." (SNW: "Under the Cloak of War")
Harper was played by Vanessa Smythe.
This character was only named in the source's end credits. Her position of "medical officer" was identified in the episode's audio description, and wore a dark gray uniform undershirt, unlike the light blue ones worn by doctors and white worn by nurses.