President Bush's nominee to the Supreme Court, Appeals Court Judge John Roberts, is someone with broad knowledge of the nation's top court.
In the 1980's, he worked as a clerk for William Rehnquist, who is now chief justice but then was an associate justice on the high court.
As a private attorney and later a deputy solicitor general under former President George H.W. Bush, John Roberts presented oral arguments in more than 30 cases before the Supreme Court. He also was an associate counsel to President Ronald Reagan.
He currently serves as an appeals court judge in the Washington, D.C., circuit, following his 2003 nomination by the current President Bush.
Mr. Bush's father nominated Judge Roberts to the federal appeals court during his administration, but the Senate did not confirm that nomination.
John Roberts graduated with honors from Harvard Law School.