Author Koukl holds a graduate degree in apologetics. Beyond academic credentials, he's also an experienced apologist, interacting with people regularly on his radio broadcast and via his ministry, Stand to Reason. Koukl has for years been living out his approach to conversing with others about Christianity. Tactics is Sonlight resource: https://www.sonlight.com/products/tactics-a-game-plan-for-discussing-your-christian-convictions