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Pillar's interest in foreign policy resulted in a book Terrorism and U.S. Foreign Policy first published in 1999 and updated in 2004. The back cover of the book reads:
Terrorism and U.S. Foreign Policy is an essential gulde to more effective coordination between conventional foreign policy and efforts to prevent terrorist attacks and activities. This paperback edition includes a new, extensive, and provocative post-9/11 introduction, along with the author's in-depth analyses of current terrorist threats, the status of terrorism in world politics, counterterrorism tools available to the United States, state sponsors of terrorism, and how best to educate the public about terrorist threats and counterterrorism.
A review of the book in Foreign Affairs says: "The book's strength is its nuanced sense of how Washington's counterterrorism policy actually works, day in and day out." 
The Washington Times wrote: "[Pillar] offers a valuable overview of the dimensions of terrorism and counterterrorism.... Mr. Pillar's recommendations for improving U.S. counterterrorism policy, such as paying attention to the full range of terrorist threats, as opposed to solely focusing on WMD terrorist warfare, and disrupting terrorist infrastructure worldwide, should be closely read by all those involved in the counterterrorism effort."