Rivers
Ensign Rivers was a Human male Starfleet officer in the mid-22nd century, serving as an engineer on two  starships,  and .

Serving in Starfleet by 2153, Rivers was aboard  for its mission into the Delphic Expanse, at one point serving on the same engineering team as Crewman Jane Taylor. After Enterprise received devastating damage from the Xindi during the Battle of Azati Prime in 2154, Rivers was among the crew working to repair the ship and was confronted by Chief Engineer Charles Tucker III who had been suffering from a lack of sleep. ()

After Enterprise returned home from the Delphic Expanse later that year, Rivers transferred to  under the command of Captain Hernandez, serving as an engineer aboard the ship. Prior to Columbias launch, he was assigned by Chief Engineer Tucker to work with Strong in recalibrating the injector assembly in order to bring the Columbias field matrix down to 0.3 microns. ()

Appendices

Background information 
Rivers was played by famed cartoonist (and noted Star Trek fan) Seth MacFarlane in two cameo appearances. He was not identified by name until his second appearance. Some years later, MacFarlane created and starred in The Orville, an homage to  co-produced by Brannon Braga.

In the final draft script of "The Forgotten", he was referred to simply as "a young engineer".

External link 
 

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Humans
Starfleet operations personnel
Enterprise (NX-01) personnel
Columbia personnel