Thomas Joseph Ridge (born August 26, 1945) is an American politician and author who served in the George W. Bush administration as the assistant to the president for homeland security from 2001 to 2003 and as the United States secretary of homeland security from 2003 to 2005. He was the first person to hold either office. A member of the Republican Party, he previously served in the United States House of Representatives from 1983 to 1995 and as the 43rd governor of Pennsylvania from 1995 to 2001.