Has created some good T.V. shows such as Buffy the Vampire Slayer and Firefly and a internet special called Dr. Horrible's Sing a long blog all of these are very good the question is have you heard of him.
Yes I've heard of Joss Whedon, I'm actually watching an episode of Buffy as I post this.
Aside from TV and the internet Joss also works on comics. Currently doing his own things as well as Buffy season 8 and overseeing Angel season 6 (Angel: After the Fall now called Angel: Aftermath). He also had a fantastic run with Astonishing X-Men as well as Runaways.