Mercedes Zellman

Mercy was the Chief of Operations/Security chief of the USS Defiant (NCC-1731) in the late 23rd century. 

Early life before Starfleet
Mercy was born on June 26, 2237 human calendar time on the planet Earth in Liverpool, England.

Chronology

 * 2237: Mercy is born on the planet Earth in Liverpool, England.
 * 2251: Mercy enters Starfleet Academy.
 * 2255: Mercy graduates Starfleet Academy and is promoted to Ensign, his first assignment is the USS Scheiner as a security officer.
 * 2258: Mercy is promoted to Lieutenant junior grade and assigned to the USS Swift as a security officer.
 * 2260: Mercy is promoted full Lieutenant and assigned to the USS Walker as the Assistant Chief Security Officer.
 * 2265: Mercy is promoted to Lieutenant Commander and is made the Chief Security on the USS Apian.
 * 2270: Mercy is promoted to full Commander is made the Chief Operations Officer/Chief Security Officer of the USS Defiant.