We know this much about him: 0.
He doesn't say. We don't ask. He just sends us stuff and if we like it, we publish it.
There are two widely opposed theories about him:
Either he's a hermit with a particularly vivid imagination who never leaves his computer;
or
he's actually out there doing all the stuff he's writing about.
We like both theories, so we don't ask. And he doesn't say...