Expert on U.S.-Israel relations, American evangelicalism, and U.S. foreign policy.
- U.S. relations with Israel
- American evangelicals and politics
- American foreign policy in the twentieth century
- Christian Zionism
- Author of *Covenant Brothers: Evangelicals, Jews, and U.S.-Israeli Relations*
- Published widely on Christian Zionism and U.S. foreign policy for Washington Post, Jerusalem Post, and other outlets.