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.
Chris Christian Chris Christian (born February 7, 1955) is an American songwriter, record producer, and a record label executive. His songs have been recorded by Elvis Presley, Olivia Newton-John, Hall and Oates, Natalie Cole, Sheena Easton, The Pointer Sisters, Al Jarreau, The Carpenters, Amy Grant, Patti Austin, Dionne Warwick, America, The Imperials, B.J. Thomas, B W Stevenson, Marilyn McCoo, Dan Peek, Cheryl Ladd, Jane Olivor, Sandi Patti, Pat Boone, Ali Lohan, Donnie Osmond, and others.