Graham Stack  has written and produced hit records for many artists including a singer who relinquished her American what?
Tina Turner Tina Turner (born Anna Mae Bullock; November 26, 1939), is an American-born Swiss recording singer, songwriter, dancer, actress, and author. Born and raised in the Southeastern United States, Turner relinquished her American citizenship after obtaining Swiss citizenship in 2013.
Gwen Sebastian Gwen Noel Sebastian is an American country music singer-songwriter. Sebastian was signed to Lofton Creek Records in 2009 and released two singles for the label. In 2012, she was a contestant on the second season of "The Voice".