Bret Devereaux

You're going to need to specific about a place/period or fortification system. Even then, I may not know the technical works. For an overview of Roman forts, Luttwak, Grand Strategy of the Roman Empire has a good cross-period comparison for a newcomer to the topic.

For an 'all over the world' view, Lee, Waging War (2015) has some ideas about how different fortification traditions interacted differently with gunpowder, which might give you a jumping-off-point to get into the individual fields of scholarship.