Age: 74.
21st secretary of defense: Appointed by President Bush in 2001, he became the oldest defense secretary at age 69.
13th secretary of defense: Appointed by President Gerald Ford in 1975, he was the youngest defense secretary in history at age 43.
Congressional service: Represented Illinois in the U.S. House.
Navy experience: Pilot from 1954 to 1957.
Professional background: Investment banker, corporate officer.
Family: Married Joyce Pierson in 1954; they have three children.