The longest-serving Republican member of the House of Representatives upon his retirement. He represented Illinois from 1969 to 2005.
He received a Ph.D. in history at Indiana University, and served several years in the U.S. Army.
He came to the House of Representatives in a special election to replace Donald Rumsfeld, who left to take a job in the Nixon administration.
Two of his brothers served him at one time in the House of Representatives, also representing Illinois.
He announced he would seek the Republican nomination for the 1978 presidential election, staying in the race despite his promise to drop out if Ronald Reagan entered.