Thomas (Tom) Barker is Professor Emeritus of Criminal Justice at Eastern Kentucky University. The former police officer, police academy instructor, and Dean of a College of Criminal Justice has been teaching, researching and writing on police subjects and adult criminal gangs for over thirty years, For the past fifteen years, he has devoted his research to the study of Outlaw Motorcycle Clubs (OMC). Dr. Barker has steadfastly argued that the majority of OMC's and their chapters are not motorcycle clubs but are in effect adult criminal gangs known for their violence and criminal activity. His research documents that American based OMCs, such as the Hells Angels, Outlaws, Bandidos, Mongols, Sons of Silence, Vagos and Warlocks have expanded their violent criminal organizations worldwide.