Singer for the band fun., which won the 2013 Grammy Award for Song of the Year for the single "We Are Young." They also received the Grammy for Best New Artist that same year.
He became sick with pneumonia as a child. Later, he joined punk bands in high school called Nevergonnascore and This Past Year.
He co-wrote "Die Young," which appeared on the album Warrior by Ke$ha.
He collaborated with singer Janelle Monae on the hit song "We Are Young."