He was one of the vault's former overseers and endorsed Vault 3's final overseer, George Stault, in his first or second campaign for overseer. He was a well-respected member of the community, and Stault felt that his endorsement won him the election.
Lincoln Davis is mentioned only in Fallout: New Vegas.
Behind the scenes
Lincoln Davis is an amalgamation of the last names of Abraham Lincoln and Jefferson Davis, the presidents of respectively the Union and the Confederacy during the American Civil War.