Mat Sinner
 Mat Sinner is a bassist vocalist and record producer from Stuttgart in Germany.His main bands have been Sinner since 1982 and Primal Fear since 1997 which he formed with Ralf Scheepers. He has been involved in numerous other projects throughout his musical career. Mat joined Voodoo Circle permanently in 2008 and worked recently active as a record producer for Kiske/Somerville Bobby Kimball/Jimi Jamison (Toto/Survivor) and the first Ralf Scheepers solo album.