YouTuber, novelist and tuberculosis activist and John Green from visits the United Nations headquarters for the high-level meeting on the fight against tuberculosis.

John Green is an American author of fiction books for young people, including “The Fault in Our Stars,” which is one of the best-selling books of all time. John and his brother Hank have a popular YouTube channel and encourage their online-based community to support charitable causes. John is also a tuberculosis activist working closely with the nonprofit organization Partners in Health. This was his first time speaking at the UN.