He also married a Muslim woman he met abroad, prompting his conversion to Islam. Colleagues said he doesn’t shy away from mentioning his religion but is not demonstrably observant. There is no prayer rug in his office, officials said, although he is known to clutch a strand of prayer beads…

[C]urrent and former senior U.S. intelligence officials said it is no accident that Roger’s tenure has coincided with a remarkably rapid disintegration of al-Qaeda — and the killing of bin Laden last year.

When Michael V. Hayden became CIA director in May 2006, Roger began laying the groundwork for an escalation of the drone campaign. Over a period of months, the CTC chief used regular meetings with the director to make the case that intermittent strikes were allowing al-Qaeda to recover and would never destroy the threat.

“He was relentless,” said a participant in the meetings. Roger argued that the CIA needed to mount an air campaign against al-Qaeda “at a pace they could not absorb” and warned that “after the next attack, there would be no explaining our inaction.”…

[T]he CTC chief proposed launching what came to be known as “signature strikes,” meaning attacks on militants based solely on their patterns of behavior.

Previously, the agency had needed confirmation of the presence of an approved al-Qaeda target before it could shoot. With permission from the White House, it would begin hitting militant gatherings even when it wasn’t clear that a specific operative was in the drone’s crosshairs.