Mr. Davidson was well known to have a severe (almost homicidal) temper by his co-workers, such as hitting co-worker Roger over the head with a pool cue and mentioning to stab Sharon "in the fucking throat" if she spilled coffee on him again. After inspecting many of the shipments that were meant for the region's vaults, Dr. Martin Reid, one of his co-workers, became suspicious about his real intentions. Sharon was also noticed by Walter Scott to be missing a few days after Mr. Davidson made the entry threatening to stab her in the neck with a pen on his terminal. Conspicuously, a skeleton in a lab coat can be found in the building's basement with a pen lying next to it. Mr. Davidson also makes mention of potentially needing to discipline Dr. Reid for his theories regarding a Vault-Tec conspiracy.
Frank Davidson is mentioned only in Fallout 4.