Heather MacCallum

Lt. j.g. MacCallum was the Assistant Head Nurse onboard the USS Intrepid (NCC-1738) in the late 23rd century. 

Early life before the Intrepid
Heather was born on November 9, 2246 human calendar time on the planet Earth in Edinburgh, Scotland.

Chronology

 * 2246: Heather is born on the planet Earth in Edinburg, Scotland.
 * 2264: Heather enters Starfleet Academy
 * 2268: Heather graduates Starfleet Academy and promoted to Ensign, his first assignment is Starbase 12 as a nurse.
 * 2270: Zandra is promoted to Lieutenant junior grade and assigned to the USS Intrepid as assistant head nurse.