Chris A. Vrenna (born February 23, 1967) is an American musician, Grammy-winning producer, engineer, remixer, songwriter, programmer, and founder of the electronic band Tweaker. Vrenna also played drums for the industrial/rock band Nine Inch Nails from 1989 until 1997. Vrenna was also the keyboardist and drummer of the American rock band Marilyn Manson from 2004 until late 2011.