Nothing is known about Alan before the apocalypse, except he was bound for Phoenix on Flight 462.
Alan's first (and only) appearance is the episode Ouroboros. Christopher Manawa comes across him as he is examining the remains of flight 462 somewhere in southern California. Alan begs Chris for help as other, Infected passengers snarl at them. Chris unbuckles him from his seat, and Alan falls to the floor, where we see his spine sticking out from his back. While still begging for help, he refuses water, indicating he wants Chris to kill him, which Chris does, with some hesitation.
- It is unknown how Alan survived so long with a serious back injury and without access to food or water. According to the timeline, Chris found him at least two weeks after the outbreak began.