Junior Vasquez (born Donald Gregory Mattern, August 24, 1949 in Lancaster, Pennsylvania), is an American club DJ and remixer/producer.Mattern moved to New York as a young adult in 1971 with ambitions of becoming a fashion designer, briefly attending Fashion Institute of Technology (FIT) and working as a hairdresser for a while. However, Mattern soon became fascinated with NYC nightlife especially the work of DJ Larry Levan at the Paradise Garage. After adopting the pseudonym "Junior Vasquez", he commenced his career in music production in the 1980s. Vasquez began to work with DJ and pop remixer/producer Shep Pettibone, and together they co-produced and edited numerous singles from such artists as Madonna, Whitney Houston, Janet Jackson, MC Hammer, Prince, Pet Shop Boys and others. It wasn't long before Vasquez landed a brief residency at Club Bassline, where he began to make a name for himself as a live DJ.