WASHINGTON – Beginning to put his team in place for his second term, President Bush decided to keep Andrew Card as White House chief of staff, retaining an unflappable veteran of the Reagan and first Bush presidencies.

Mr. Card’s first assignment: help the president reshape the administration for the term that begins in January, sorting through possible personnel changes in the Cabinet and elsewhere.

Messrs. Bush and Card moved deliberately and privately yesterday, both staying out of public view after a weekend of brainstorming at the Camp David presidential retreat in Maryland. At the Pentagon, Defense Secretary Rumsfeld said the subject of his future did not come up in several meetings with Mr. Bush since the election.

“Needless to say, either one of us would discuss it with the other before discussing it with you,” Mr. Rumsfeld told a roomful of reporters. Rumsfeld aides have said they expect him to remain in the job for the start of Mr. Bush’s new term, although whether he aims to stay the full four years is unclear.

A Treasury Department official in charge of keeping tabs on the nation’s financial markets, including Wall Street, announced that he intends to leave his post at the end of December. Brian Roseboro, the department’s undersecretary for domestic finance, revealed his intentions in a resignation letter to Mr. Bush. Mr. Roseboro, who has been at Treasury since 2001, was sworn in as undersecretary on April 16 of this year.

Top White House officials are said to be leaning on many of their subordinates to stay in place, part of an effort to maintain stability.

Mr. Card has the lead role, but Clay Johnson, deputy director of the Office of Management and Budget, who led Mr. Bush’s transition into the Oval Office in 2001, and Dina Powell, assistant to the president for personnel, are intimately involved in White House discussions on second-term personnel.

By accepting an invitation to continue serving, Mr. Card ensured his place in history as one of the longest-serving chiefs of staff. The last staff chief served five years was Sherman Adams, whose boss, President Eisenhower, created the position.

Mr. Card’s most visible moments came on September 11, 2001, when he whispered in Mr. Bush’s ear that airliners had slammed into the World Trade Center; and Wednesday morning, when he told the world before dawn that Mr. Bush believed he had won the election.

Mr. Bush values Mr. Card for his generally low-profile style. Mr. Card doesn’t seek attention, only rarely granting press interviews.

Keeping Mr. Card aboard is “a real pin strike for the president,” said Mr. Bush’s former liaison to Capitol Hill, Nick Calio. “He is a very, very solid leader; he is one of the most capable people I have ever met or worked for in my entire life; and he manages without ego and solely on behalf of the president.”