Chad Vaccarino is an American singer-songwriter and musician, best known as one half of the pop duo A Great Big World. Born on March 17, 1986, in New York, he gained fame with the hit song "Say Something," which features Christina Aguilera. The song received critical acclaim and earned several awards, including a Grammy Award nomination. Vaccarino studied at New York University, where he developed his passion for music. Alongside his musical career, he is also known for his work in mental health advocacy, using his platform to raise awareness about mental health issues and support those in need.