John Green and Hank Green are American authors and content creators known for their work in literature and online media. John is best known for his young adult novels, including The Fault in Our Stars and Looking for Alaska, while Hank is recognized for his educational YouTube channels, such as Crash Course and SciShow. Together, they co-created the popular YouTube channel Vlogbrothers, where they communicate through video blogs. They also founded the annual event Nerdfighteria, which promotes community and charitable giving among their fans, known as Nerdfighters. Their collaborative efforts have significantly influenced online culture and education.