Paul O'Neill was an American composer, lyricist, record producer, and guitarist. He was the producer of the progressive metal band Savatage, and the founder of Trans-Siberian Orchestra.

Hall of the Mountain King is the fourth studio album by the American heavy metal band Savatage, released in 1987 under the direction of producer Paul O'Neill. It is their first album produced by O'Neill, who was assigned to the band after the tour in support of Fight for the Rock. O'Neill's influence pushed Savatage to adopt a conceptual progressive metal style beginning with this album.