Were Carl Sagan and Mary Doria Russell both American? 
Mary Doria Russell: Mary Doria Russell (born August 19, 1950) is an American novelist. Carl Sagan: Carl Edward Sagan ( ; November 9, 1934 – December 20, 1996) was an American astronomer, cosmologist, astrophysicist, astrobiologist, author, science popularizer, and science communicator in astronomy and other natural sciences.
yes