The spy agency’s director spoke the day before his first meeting with the president-elect.

A by-the-numbers analysis of suicide terrorism.

A law professor offers an inside look at his experience on a presidential panel reviewing how the government protects national security and preserves civil liberties.

A retired general on learning from failures in Iraq and Afghanistan.

Political-science graduate student Jenna Jordan finds that eliminating a terrorist organization's leader isn't necessarily a knockout punch.

Studying terrorism’s social context produces complicated answers about its causes.