Peter White Television EditorEXCLUSIVE: Gregory Diaz IV, who is starring in Jon Chu’s upcoming Warner Bros feature musical In The Heights, has signed with UTA.The 15-year-old actor previously appeared on Netflix’s Unbreakable Kimmy Schmidt and NBC’s New Amsterdam.Diaz made his name on Broadway with his performance as Bruce in Matilda the Musical in 2016 and also performed Off-Broadway in Pedro Pan, Zurich and You’re a Good Man, Charlie Brown.He plays Sonny de la Vega in In the Heights, which is