Samuel Long, known professionally as Sophie (stylized as SOPHIE) is a London-based record producer and DJ, who came to prominence with "Bipp"/"Elle" and "Lemonade"/"Hard" in 2013 and 2014. His music is described as a "hyperkinetic" take on pop music, and typically features high-pitched female vocals and artificial, synthesized electronic textures. He has worked closely with artists from the PC Music label, including A.G. Cook and QT, and has produced for acts such as Charli XCX, Le1f, Madonna, Liz, and Namie Amuro.

His debut album Product was released in 2015.