A native of Fort Worth, Texas, Mr. Marrs earned a Bachelor of Arts degree in journalism from the University of North Texas in 1966 and attended Graduate School at Texas Tech in Lubbock for two years more. He has worked for several Texas newspapers, including the Fort Worth Star-Telegram, where beginning in 1968 he served as police reporter and general assignments reporter covering stories locally, in Europe and the Middle East. After a leave of absence to serve with a Fourth Army intelligence unit during the Vietnam War, he became military and aerospace writer for the newspaper and an investigative reporter. Since 1980, Mr. Marrs has been a free-lance writer, author and public relations consultant. He also published a rural weekly newspaper along with a monthly tourism tabloid, a cable television show and several videos.

In 2007, Mr. Marrs retired from the University of Texas at Arlington where he had taught a course on the Kennedy assassination since 1976. In 1989, his book,