The latest instalment of International Security Journal’s Leaders in Security series sees guest host, John Cowling speak with Lt Col David Grossman.

Lt Col Grossman is a best-selling Author and Law Enforcement Trainer with a distinguished military career. In part 1 of this explosive interview, the pair discuss the alarming increase in murder rates around the world and the psychology of killing.

Watch part 1 of the interview above and look out for part 2 coming soon!

Catch up with the rest of the Leaders in Security series here