Guitarist for the Grammy Award-winning alternative rock band fun., the group who broke out with the #1 hit "We Are Young."
He collaborated on the song "How Come You Don't Want Me" with the indie group Tegan and Sara in 2013.
He is the band fun. with Nate Ruess.
He was the singer of the band Steel Train in 2002.
He dated Girls creator Lena Dunham.