Claim: Christopher Memminger was a German-born American politician and a secessionist who participated in the Confederate States as the first  Confederate States Secretary of the Treasury while Jefferson Davis was the president.
Evidence: Christopher Gustavus Memminger (German: Christoph Gustav Memminger; January 9, 1803 – March 7, 1888) was a German-born American politician and a secessionist who participated in the Confederate States. As the first Confederate States Secretary of the Treasury, Memminger was the main author of the economic policies of Jefferson Davis's administration. Jefferson Finis Davis (June 3, 1808 – December 6, 1889) was an American politician who served as the president of the Confederate States from 1861 to 1865. 
Jefferson Davis Christopher Gustavus Memminger (German: Christoph Gustav Memminger; January 9, 1803 – March 7, 1888) was a German-born American politician and a secessionist who participated in the Confederate States.