DJ Sledge Hammer (Stefan Herzog) is a 20-year‑old composer, producer, and remixer from Austria. He has been a professional music producer since 2004. He has worked with other producers such as Rob Mayth, Indurro, Marc Korn, Marc van Damne, Alex Megane, Mike Wind aka Staircase, DJ Red Star, Axel Konrad, and Chris Da House.