Curator

You may be looking for the mysterious figure known as the Curator.

A curator was the manager of an institution like a museum.

Venna Durwell was the curator of EarthWorld. (PROSE: EarthWorld)

Eve was the curator at the Museum of the Last Ones. She wanted to preserve the Tenth Doctor in the newly-opened Gallifrey section. (PROSE: The Last Dodo)

The curator of the National Gallery in London told the Eleventh Doctor that the name of the Time Lord painting in the Gallery was neither No More nor Gallifrey Falls, but Gallifrey Falls No More. (TV: The Day of the Doctor)

Mesa was a curator on the Braxiatel Collection during the Fifth Axis occupation. She was killed in a terrorist bombing. (PROSE: The Traitors)