Chris 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 2007 until late 2011.
Soon after graduating from McDowell High School in Erie, Pennsylvania in 1985, Vrenna moved to Chicago, quickly becoming a part of the Chicago industrial music scene and was briefly a member of Die Warzau and Stabbing Westward.
He later reconnected with Trent Reznor, whom he met during high school in Pennsylvania, when they both were in local Cleveland, Ohio band the Exotic Birds. He also toured as a live drummer for KMFDM during the Money era tours, in 1992. He is currently[when?] recording under the name Tweaker, and has released three albums under that name, The Attraction to All Things Uncertain (2001), 2 a.m. Wakeup Call (2004) and Call The Time Eternity (2012). Tweaker toured select North American dates with Skinny Puppy in 2004.