Robert Barrett is one of the leading researchers in field research with Nigerian terrorist groups. Barrett contributes a unique perspective to this type of research because his studies are conducted with current, not former, members of insurgent groups. Barrett's 2008 field research study revealed unique typologies and motivations for radicalization as reported by insurgent groups. For instance, individuals that were radicalized expressed sentiments of volunteerism, yet extremist recruiters conveyed that their objective was to make “coercion feel like volunteerism.” Barrett asserted that the motivations to become radicalized can be characterized as: ideologue, combatant, criminals, pragmatist, soldier, and follower.