Dr. Kepler is a scientist who worked at the facility that Beyond Closed Doors takes place and likely conducted experiments on entities. He kept a log consisting of two audio recordings (see page "Audio Recordings").
Dr. Naoma created 3 audio recordings and was most likely very specialized and experienced in handling monsters, considering how he was able to list Herbert's physique and mental capacity. Additionally, the Naoma Room (see page "Setting" is named after him. Naoma died in the Cavern after being attacked by a leecher. (See page "Entities").
After recording Tape One, Dr. Kepler visited the Laboratory. There, he saw an entity, most likely Herbert, rampaging and murdering his colleagues. Dr. Naoma likely witnessed Herbert's escape before Kepler arrived. At least two scientists, Kepler and Naoma escaped Herbert's grasp. Kepler made it to the storage room; Naoma made it to the Maze. Naoma and Kepler escaped together and made it to the Master Room. The two scientists made it to the Cave, where Naoma yielded to a leecher and died. Kepler's current whereabouts are unknown.