JT Eberhard, author of the popular blog WWJTD, is a fast rising star within the atheist community. He knows it but doesn't behave like it, and I do not think he ever will. It's just not something that seems within his personality.
JT co-founded Skepticon, the largest free atheist convention in America. Of the few I've been to, it's my favorite, with the exception of the Reason Rally of course. Their speakers have included Richard Carrier & PZ Myers (who have both been at all 5), Dan Barker, Matt Dillahunty, Hemant Mehta, Brother Sam Singleton, and more.
He also spent some time with the Secular Student Alliance, helping kids in high school start SSA chapters at their schools.
At Lobby Day, the day before the Reason Rally, there was some buzz about the fact that he was there participating. Although, that was mostly centered around comments about him and his girlfriend being excessively cute together. If you've seen them together, you know what I mean. Especially if you saw his talk at Skepticon 5.
As good as that talk was, his workshop on activism, earlier the same day, was better. It was informative and fun, which fits his main point about how to do activism effectively. Make it fun. This attracts both attention to the cause and people to participate. I previously said the debater I most wanted to emulate was Christopher Hitchens, but the activist I would choose to emulate is JT. I'm hoping to get him to Omaha to do that workshop for the people here, who I already know are interested in activism.
I doubt JT would like being put on a list like this one, but having met him a few times, and being aware of what he's done for the movement, I wasn't left with any other choice. He's done amazing things for the movement and will likely do even more.
It's those things done that has him on this list. He's not content just to write a popular blog, which he does well. He's not content just to debate Christians, which he does well. As he once put it (in a post I was hoping to link to but could not find), he's out there doing shit. We should all be so motivated. After all, we know he's doing shit for a very worthy cause.