Large Professor (a.k.a. Large Pro or The Extra P), is a new york based hip-hop record producer and rapper. He is best known as a member of the influential early-90sunderground hip-hop group Main Source, and for discovering immensely popular rapperNas. Large Professor produced much of Nas' first album, Illmatic, which is considered one of the most important albums in hip-hop history. He hails from the borough of Queens, specifically the neighborhood of Flushing.