I could explain who Joss Whedon is, but let’s let Wikipedia do it:

Joseph Hill “Joss” Whedon is an American screenwriter, executive producer, film and television director, comic book writer, occasional composer, actor, and the founder of Mutant Enemy Productions and co-creator of Bellwether Pictures. He is best known as the creator and showrunner of the television series Buffy the Vampire Slayer (1997–2003), Angel (1999–2004), Firefly (2002) and its follow-up film Serenity (2005), and Dollhouse (2009–2010), as well as the web-series Dr. Horrible’s Sing-Along Blog (2008). Whedon also co-wrote Toy Story (1995), co-wrote and produced the horror film The Cabin in the Woods (2012), and wrote and directed the film adaptation of Marvel’s The Avengers (2012),[12][13] the third highest-grossing film of all time.

And here’s his take on why we should all vote for Romney for President: