When was the American government official which took over from Thomas A. Shannon Jr. after he was confirmed born? 
Thomas A. Shannon Jr.:  In early 2017, Shannon served as acting United States Secretary of State until President Donald Trump's nominee, Rex Tillerson, was confirmed. Rex Tillerson: Rex Wayne Tillerson (born March 23, 1952) is an American government official, civil engineer, and former energy executive who is the 69th and current United States Secretary of State, serving since February 1, 2017.
March 23, 1952