Brian Cain is a sergeant with the Holly Springs (Ga.) Police Department, and is known as the "Millennial cop" on Twitter. He has been in law enforcement since 2000. He hosts and produces a podcast for Millennials in law enforcement.
Brian Ostro is an NRA-certified pistol and rifle instructor. He teaches concealed-carry courses in west central Florida. He also runs a firearms and related-topics discussion online forum.
Brian Willis is a retired officer, trainer and author who now serves as deputy executive director for the International Law Enforcement Educators and Trainers Association (ILEETA).