John D. Marks (born 1943)[1] is the founder and former president of Search for Common Ground (SFCG), a nonprofit organization based in Washington, D.C., that focuses on international conflict management programming.[2][failed verification] Marks now acts as a senior adviser to SFCG. He is also a former foreign service officer of the U.S. Department of State, and he co-authored the 1974 book The CIA and the Cult of Intelligence with Victor Marchetti.