Daniel Leonard Nigro ( NIGH-gro; born May 14, 1982) is an American musician, songwriter, instrumentalist and record producer. He was the lead singer and guitarist of the indie rock band As Tall As Lions. Nigro has produced, written and co-written songs for singers Kylie Minogue, Caroline Polachek, Olivia Rodrigo, Conan Gray and many others. He won a Grammy Award for Best Pop Vocal Album for producing Rodrigo's Sour album.

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