Nathan Fielder, the absolute genius mad lad behind Comedy Central's Nathan For You, has signed a one-year overall deal with HBO, according to Variety. Under the deal, the comedian will serve as executive producer on a documentary-comedy hybrid series How To…With John Wilson as well as write, direct, and star in a yet-untitled comedy pilot. As ya probably guessed, the half-hour docu-series will star New York documentarian John Wilson, with Tim and Eric Awesome Show Great Job producer Clark Reinking joining Fielder as executive producer. Here's a synopsis: “How To…With John …