Alongside Bob Thiele Jr., Curtis Stigers and Kurt Sutter, Kushner co-wrote the theme song for the 2008 FX television series Sons of Anarchy titled "This Life".
Di samping Bob Thiele Jr, Curtis Stigers dan Kurt Sutter, Kushner co-menulis lagu tema untuk tahun 2008 Sons serial televisi FX of Anarchy berjudul "Hidup Ini".