VanHagan

 is a member of the High Order of the Children of the Cathedral around 2161.

Background
VanHagan works as a messenger between the Master and the Lieutenant. He can be found be beside the Lieutenant when you first meet him.

Interactions with the player character
The player can overhear a conversation between VanHagan and the Lieutenant about a planned invasion of Vault 13, for 1000 xp.

Appearances
VanHagan appears only in Fallout.