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.
Kristinia DeBarge Kristinia Jamie DeBarge ( ; born March 8, 1990) is an American singer, songwriter, dancer and actress. DeBarge first appeared on national television in 2003 as a contestant on the "American Idol" spin-off, "American Juniors". In 2009, DeBarge signed a contract with the Island Records department Sodapop, releasing her debut album, "Exposed", in July of the same year. The first single, "Goodbye", reached the top 20 in the US and Canada.