William Henry "Hank" Green (born May 5, 1980) is an American entrepreneur, musician, and vlogger, known for his YouTube channel VlogBrothers, where he and his brother, John Green, regularly upload videos. He is also the creator of the online environmental technology blog EcoGeek, and the founder of Subbable which was acquired in 2014 by Patreon. Hank and his brother John created VidCon, the world's largest online video conference/convention.