Gregg Michael Gillis, known professionally as Girl Talk, is an American disc jockey who specializes in mash-ups and digital sampling. He blends elements from a vast array of pop, hip-hop, and electronic music, creating dense, danceable tracks. His live performances are known for their immersive, party-like atmosphere, often featuring crowdsourced dancers and a celebratory vibe. Gillis has released five LPs on the record label Illegal Art and EPs on both 333 and 12 Apostles. He gained widespread recognition with albums like Night Ripper (2006) and All Day (2010), both of which were released for free online, contributing to his significant online following and influence on the mashup genre. His work has sparked discussions about copyright, sampling, and the nature of artistic creation in the digital age. He was trained as an engineer.