John Roberts has been installed as the nation's 17th chief justice.
President Bush was on hand for the investiture. Smiling justices stood and greeted their new leader. The Roberts family looked on as Roberts took the oath, then the center seat on the bench.
Justice John Paul Stevens, the court's senior member, extended wishes for "a long and happy career in our common calling."
Roberts wore a plain black robe without the gold arm stripes that had been used by his predecessor, William Rehnquist. Rehnquist died last month at age 80. His 33 years on the Supreme Court included 19 as chief justice.
The high court hears two cases today: one on labor and the other on fuel taxes.
The justices will not hear arguments tomorrow because of the Jewish New Year holiday.