John Green is an American author and YouTube personality born in 1977. He has written several young adult novels, including "Looking for Alaska," "The Fault in Our Stars," and "Turtles All the Way Down," which have all been bestsellers. Green is known for his ability to capture the emotions and experiences of teenagers, as well as his use of vivid language and complex characters. He is also a co-creator and host of the popular YouTube channel Crash Course, which provides educational videos on a range of topics. Green has won numerous awards for his writing and has been recognized for his philanthropic work and advocacy for mental health.