William Henry "Hank" Green II (born May 5, 1980) is an American entrepreneur, musician, and vlogger, known for his YouTube channel, VlogBrothers where he regularly uploads videos along with his brother, John Green. He is also the creator of the online environmental technology blog EcoGeek, and the developer of Subbable. Hank, along with John Green is the co-creator of VidCon, the world's largest online video conference/convention. He is involved with several other channels on YouTube, including Crash Course, SciShow, The Lizzie Bennet Diaries, The Brain Scoop, Animal Wonders, and Sexplanations.