Rahm Emanuel, Chief of Staff
Despite his infamous reputation for aggression and unnecessarily tough tactics, Emanuel is consistently demonstrating patience and composure. Exhibiting an uncharacteristic ability to delegate actions to others while thinking strategically. Has already moved or launched several major initiatives, with still more under-the-radar programs in the pipeline. Deserves much of the credit for getting an Administration filled with White House first timers (including his boss) off to a fast start, with only a few minor errors of substance, tone and relations with Capitol Hill. Living up to the great potential Obama saw in him when he insisted that Emanuel take the job.
—By Mark Halperin
See behind-the-scenes pictures of the Obama administration's first 100 days.