Lieutenant junior grade Marquez was a Starfleet science officer serving in the Stellar sciences department aboard the USS Enterprise-D in 2369.

He participated in the mission to rescue the Bersallis III colonists from the fire storms native to the planet, and was tasked with the job of tracking the storms and updating other Enterprise-D teams on its path. (TNG: "Lessons")

Marquez passed Doctor Beverly Crusher and the Ferengi scientist Doctor Reyga in a corridor and was greeted by Crusher. (TNG: "Suspicions")

Marquez was a nonspeaking role played by background actor Robert Cox.
His voiceover in "Lessons" was dubbed by an unknown actor.
While the script, subtitles, official website and the Star Trek Encyclopedia (4th ed., vol. 2, p. 22) use this spelling, the Star Trek: The Next Generation Companion uses Marques, as does the "cast" section of the script.

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