Simplify the following text for a Grade 9 native English-speaking person.
Original: John William Snow ( born August 2 , 1939 , in Toledo , Ohio ) served as the 73rd United States Secretary of the Treasury .
Simplified: John William Snow ( born August 2 , 1939 , in Toledo , Ohio ) was the CEO of CSX Corporation , and served as the 73rd United States Secretary of the Treasury under U.S. President George W. Bush .