Hank Green is a "internetainerpreneur" who has produced videos for YouTube (SciShow, Crash Course, The Brain Scoop) , NASA, and The Discovery Channel, but mostly for Nerdfighteria. He and his brother, author John Green, make up the VlogBrothers and are co-creators of VidCon, the world's largest online video conference/convention. He's also written for a variety of publications, including The New York Times, Scientific American, and Mental Floss Magazine.