Josh Hartwell isn't one of those larger-than-life actors: no booming voice, no huge presence. His work is quiet, intelligent and subtle, and he slips into a role rather than overpowering it. All this made him perfect for the character Alan in This. Because he's a mnemonist and can remember entire conversations verbatim, Alan's become the chronicler for his group of friends, a charge that makes him a little crazy. He's anxious and neurotic in general, but, as played by Hartwell, also unexpectedly compassionate.