 Complete the following phrase:  Nathan Wei Chen born May 5, 1999 is an American figure skater. He is a three-time World champion 2018, 2019, 2021, a 2018 Olympic bronze medalist in the team event, the 2017 Four Continents champion, a three-time Grand Prix Final champion 2017, 2018, 2019, and a five-time U.S. national champion 201721. At the junior level, Chen is the 201516 Junior Grand Prix Final champion, 201314 Junior Grand Prix Final bronze medalist, and 