In steps Pete Rouse, a former top aide to a former Senate majority leader, Tom Daschle.

FORBES: Everything You Need To Know About Pete Rouse

Mr McDonough's other predecessors in the role were Rahm Emanuel, William Daly and Pete Rouse.

BBC: Barack Obama names Denis McDonough as chief of staff

Along with Pete Rouse, he was able to show me where the restrooms were and -- (laughter) -- how you passed a bill.

WHITEHOUSE: Remarks by the President at a Personnel Announcement

How will Jack Lew and Pete Rouse split up their duties?

WHITEHOUSE: Press Briefing