Since retiring as a Senior Foreign Service Officer (Minister-Counselor) in 1995, Ambassador Marks has engaged in consulting, lecturing, and writing, primarily on terrorism, interagency coordination, United Nations affairs, and complex international emergencies. Ambassador Marks was recalled to active duty in 2002-5 to serve as the Department of State's advisor on terrorism to the United States Pacific Command.
He is a Member of the Board of Directors, American Diplomacy. A member of the American Foreign Service Association (AFSA) since 1959, Ambassador Marks most recently served as a Retiree Representative on the Governing Board (2011-15) and Governing Board Liaison to the Award Committee. He has also served as elected Member of the Governing Council and Chairman of the FSJ Editorial Board, and Member of the Board of Governors of DACOR (Diplomatic and Consular Officers, Retired).
Past activities include Distinguished Senior Fellow. George Mason University Program on Peacekeeping Policy, and a Senior Mentor at the Joint Forces Staff College in Norfolk, Virginia. Between August 2012 and November 2014, Ambassador Marks was a Director and then Washington Representative of The Simons Center for Interagency Cooperation, a program of the Command and General Staff College Foundation of Ft. Leavenworth, Kansas. He was a Founding Trustee of the CGSC Foundation.
Ambassador Marks was appointed to the Foreign Service in 1956 with early assignments mainly in Africa. Senior positions included Ambassador to the Republics of Guinea-Bissau and Cape Verde, the Department of State's Deputy Coordinator for Counterterrorism, Visiting Senior Fellow on terrorism at the Center for Strategic and International Studies (CSIS), Deputy Chief of Mission in Sri Lanka, Deputy United States Representative to the Economic and Social Council of the United Nations in New York, and Senior Fellow at the National Defense University.
Born in Chicago, Illinois in April 1934, Ambassador Marks attended public schools in Detroit, Michigan and graduated from the Universities of Michigan (BA, 1956) and Oklahoma (MA Economics, 1976), the National War College (1981) and served in the United States Army (1956-58). He has written extensively, and co-authored the books US Government Counterterrorism Programs: Who Does What and US Government Counterterrrorism Programs: Nixon to Trump.