Galen was an inspirational medical practitioner whose name was among several Starfleet doctors, their patients, and medical personnel in historical and literary contexts, which were included in the Emergency Medical Hologram programming.

When asked by Kes of the name individual included in that programming who inspired The Doctor, which he could name himself after. Among the individuals chosen were Dr. Galen, Dr. Salk and Dr. Spock. None of those names, however, were ones The Doctor could see himself with. (VOY: "Ex Post Facto")

This character was only mentioned in dialogue.
"Galen" is likely a reference to the famous ancient Greek physician of the same name.
According to the Star Trek Encyclopedia (4th ed., vol. 1, p. 293), Galen "postulated that Human arteries carried blood, not air as had been previously thought."

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