Steve Duda is an American DJ, record producer, audio engineer, manager and software engineer from Menlo Park, California. He is best known for his mid-2000s collaborative electronic music projects with Canadian record producer and DJ Deadmau5 under the names "BSOD" and "WTF?" and owning the record label and digital music software company Xfer Records. He is also known for creating the VST plugin Serum and Serum 2.