From last.fm:

Herbert Anthony Stevens IV (born February 23, 1987), better known by his stage name Ab-Soul, is an American hip hop recording artist from Carson, California currently signed to Top Dawg Entertainment and Interscope Records. Stevens is a member of hip hop supergroup Black Hippy along with fellow West Coast rappers and label mates Jay Rock, Kendrick Lamar and ScHoolboy Q. Read more about Ab-Soul on Last.fm.