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Darren Billy, Jr., professionally known as Lab Ox, is a Grammy award-winning American hip-hop, R&B, pop rock, R&B, urban and pop producer from Houston, Texas. He has produced and written songs for artists and groups including Gary Clark Jr., Rihanna, Willow Smith, James Fauntleroy, Nicki Minaj, 50 Cent, Lloyd Banks, G-Unit, Drake, and Yolanda Adams. He was the first producer signed to Jay-Z's record label Roc Nation upon the labels launch in 2009, and remained active on the label until his departure in early 2016.