What's the point of the book, One Assembly?

Jonathan (@JonathanLeeman) edits the 9Marks series of books as well as the 9Marks Journal. He is also the author of several books on the church. Since his call to ministry, Jonathan has earned a master of divinity from Southern Seminary and a Ph.D. in Ecclesiology from the University of Wales. He lives with his wife and four daughters in Cheverly, Maryland, where he is an elder at Cheverly Baptist Church.