The leader of the Federation anthropological team hidden on Mintaka III in Who Watches the Watchers, who urges Picard to pose as a god to limit cultural damage.
Dr Barron heads a small team observing the proto-Vulcan Mintakans from a concealed duck blind. He appears in the third-season episode Who Watches the Watchers, set in 2366, when a reactor failure exposes the post and injures its staff.
A Mintakan named Liko is hurt, treated aboard the Enterprise and returns home convinced he has seen a supreme being called the Picard. With his colleague Palmer missing among the villagers, Barron fears the outcome if a religion grows up unguided.
He advises Picard to appear before the Mintakans as their Overseer and lay down commandments, arguing that the contamination has already happened. Picard refuses to push them back towards superstition and chooses to show their leader Nuria the truth.