He served as Principal Private Secretary to the Prime Minister from 2010 until 2012.

Stanley became the longest serving Secretary occupying the position until 1964.

McNamara is the longest serving Secretary of Defense, amassing 2,595 days between 1961 and 1968.

He served as that state's tenth Secretary of State, serving for two terms from January 3, 1870 to January 5, 1874.

He was the first confirmed Latino Cabinet member and the longest serving Secretary of State in Pennsylvania history.

Rumsfeld is also the second longest serving Secretary of Defense, behind Robert McNamara.

He also served as an Assistant (Corresponding) Secretary of Missions for his denomination, beginning in 1912.

He served as that state's eleventh Secretary of State, serving for two terms from January 5, 1874 to January 7, 1878.

She is the longest serving Secretary of State in New Mexico History.

When he stepped down on July 7, 2006, he was the longest serving Secretary of Transportation since the position's inception in 1967.