· Federal Bureau of Investigation · Drug Enforcement Agency
· Central Intelligence Agency · High Intensity Drug Trafficking Area
· Bureau of Alcohol, Tobacco, Firearms and Explosives · U.S. Secret Service

Mr. Marks independently authored The Emergency Responder’s Guide to Terrorism which has been adopted by such entities as the State of New York, the International Fire Service Training Association / Oklahoma State University, George Washington University, the American College of Forensic Examiners, the Federal Law Enforcement Training Center (FLETC) and the FBI Hazardous Devices School in Huntsville, AL. Mr. Marks serves as an Adjunct Professor on terrorism/WMD at the George Washington University College of Forensic Science and develops courseware for the Shenandoah University School of Pharmacy’s Bio-terror curriculum. Mr. Marks is a frequently featured lecturer at venues ranging from the Washington DC Homeland Security Symposium, lecturing on Terrorism Response in High Security Facilities, to the national Fire Department Instructor’s Conference. He has been called upon to appear before various legislative bodies, such as the California General Assembly, to provide expert testimony on terrorism and other threat related topics. Commissioned as a Virginia law enforcement officer, Mr. Marks served the Atlantic and Pacific Railroad police department in the development of that agency’s bomb detection unit.