For the past three decades, Libya has been a rich recruiting ground for the global jihad. Investigating the precursors and then subsequent evolution of the Islamic State of Iraq and al-Sham (ISIS) and other extremist actors throughout this period presents actionable insights into how jihadist actors coalesce; how they interfere in post-conflict state building; the threats they pose to civilians, nascent economies, and external states; and finally, what complexities remain when their hold on territory has been eradicated, but their adherents have not been killed nor their ideology debunked. In The Origins and Evolution of ISIS in Libya, Jason Pack, Rhiannon Smith, Karim Mezran examine ISIS’s pre-history, birth, expansion, consolidation, and dispersal in Libya, as well as the broader political context of the country. They offer advice and recommendations for how Western governments and militaries should approach jihadist actors globally.