Darold Durard Brown Ferguson Jr., known professionally as FERG, is an American rapper from Harlem, New York City. He is a lead member of the hip hop collective ASAP Mob, from which he adopted his moniker and signed a recording contract with Polo Grounds and RCA Records—the same labels that helped launch ASAP Worldwide—in January 2013. Two years prior, the group's cohorts, ASAP Rocky and the late ASAP Yams, effectively negotiated their own contract with the label.

ASAP Mob is an American hip hop collective formed in 2006 in Harlem, New York City, that consists of rappers, record producers, music video directors and fashion designers.