Martin Harold "Marti" Frederiksen (born July 1, 1962) is an American songwriter, record producer, and musician. He writes and produces music primarily in rock, country, and pop. He is best known for his work with many hard rock bands including Daughtry, Aerosmith, Def Leppard, Fuel, Mötley Crüe, Ozzy Osbourne, Foreigner, Buckcherry, Black Veil Brides, Crimson Glory, COMA and film soundtracks.