Stephen L. Cookie Sewell was born in New York State and is a retired US Army Chief Warrant Officer and Department of the Army intelligence analyst.

He was trained in Vietnamese and Russian languages and has been an active Russian linguist since 1974. He was also an enthusiastic scale modeller since the age of 5 and has built numerous models of armoured vehicles, specializing in Russian, Soviet and American tanks and armoured vehicles.

He was the founder of the Armor Model and Preservation Society in 1992. While author of numerous intelligence articles he has also written extensively on American and Soviet armour and also provided a great deal of information to other authors on topics that include Korean and Vietnamese air war activities.