Rolf Jacob Sartorius (born October 2, 2002) is an American singer and internet personality who rose to fame via social media after posting lip-syncing videos on Musical.ly. In 2016, he released his debut single "Sweatshirt", which charted on the Hot 100 in the United States and in Canada.

Source: Wikipedia (https://en.wikipedia.org/wiki/Jacob_Sartorius)