Mark Zell is an American-Israeli attorney specializing in international law, lobbying, and pro-Israel advocacy. He co-founded the law firm Feith & Zell, P.C., in 1998 with Douglas J. Feith, former Under Secretary of Defense for Policy under President George W. Bush. The firm provides legal counsel and government relations services to Israeli businesses, organizations, and government entities operating or seeking opportunities in the U.S., often navigating complex regulatory, trade, and political landscapes. Zell has represented numerous Israeli clients in lobbying efforts on Capitol Hill, contributing to policy discussions related to U.S.-Israel relations, defense cooperation, and economic partnerships, positioning the firm as a key player in bridging Israeli commercial interests with American political and legal systems. A Princeton graduate, Zell lives in the Israeli settlement of Tekoa in the West Bank. He serves as chairman of Republicans Overseas Israel and chairman of Ariel University's Executive Committee. While maintaining a low public profile compared to his partner Feith, focusing on behind-the-scenes legal and lobbying work, he has been involved in various Jewish and Israeli-American organizations. His contributions have been instrumental in fostering bilateral ties, though the firm has occasionally faced scrutiny amid broader discussions about foreign influence in U.S. politics.