Lincoln Davis

 was a resident of Vault 3 in the 23rd century. He was formerly the Vault's Overseer, and endorsed Vault 3's final Overseer, George Stault, in his first or second campagne for Overseer. He was a well respected member of the community, and Stault felt that his endorsement won him the election. He presumably died or fled when Vault 3 was invaded by Fiends.

Behind the Scenes
Lincoln Davis may be refering the the two American presidents during the Civil War, Abraham Lincoln (US/North) and Jefferson Davis (CS/South).

Appearances
is only mentioned in Fallout: New Vegas.