Michael Christopher

Lt. j.g. Christopher was an Security officer onboard the USS Intrepid (NCC-1738) in the late 23rd century. 

Early life before the Intrepid
Mike was born on April 4, 2246 human calendar time on the planet Deneva.

Chronology

 * 2246: Mike is born on the planet Deneva.
 * 2264: Mike enters Starfleet Academy
 * 2268: Mike graduates Starfleet Academy and promoted to Ensign, his first assignment is Epsilon 5 as an engineer.
 * 2270: Mike is promoted to Lieutenant junior grade and assigned to the USS Intrepid as an engineer.