John Fields (born September 11 in Boston, Massachusetts) is an American record producer and musician. Fields has produced for a number of musical artists, including the Jonas Brothers, Switchfoot, Pink, Andrew W. K., Har Mar Superstar, Miley Cyrus, and Demi Lovato.He also has played a number of musical instruments on various albums, and even occasionally performed live with bands such as Nick Jonas & the Administration, Soul Asylum, and The Rembrandts.He is a founding member of the Minneapolis Funk Collective, Greazy Meal.