 US foreign policy scholars John Mearsheimer and Stephen Walt (of University of Chicago and Harvard University, respectively), focusing almost exclusively on Jewish groups, define the core of the lobby to include AIPAC, the Washington Institute for Near East Policy, the Anti-Defamation League and Christians United for Israel.Other key organizations which they state work to benefit Israel, in many cases by influencing US foreign policy, include the American Jewish Congress, the Zionist Organization of America, the Israel Policy Forum, the American Jewish Committee, the Religious Action Center of Reform Judaism, Americans for a Safe Israel, American Friends of Likud, Mercaz-USA, and Hadassah.Fifty-one of the largest and most important come together in the Conference of Presidents of Major American Jewish Organizations, whose self-described mission includes "forging diverse groups into a unified force for Israel's well-being" and working to "strengthen and foster the special US-Israel relationship."