Gates was sworn in at 7:03 a.m. (1203 GMT) by White House Chief of Staff Joshua Bolten in the chief of staff's office, a White House spokeswoman said. President George W. Bush was attended Gates' ceremonial swearing-in at the Pentagon at 1:15 p.m. (1815 GMT). The 63-year-old Gates served as CIA director from 1991 until 1993 during the administration of Bush's father. His confirmation was overwhelmingly approved in the Senate.