Although not a primary focus for me, I do on occasion write about a cappella-related things. Here is a small sampling.
I co-wrote a chapter ("2. What Is a Producer?") of the A Cappella Educators Association recording guide with my friend Robert Dietz. In it, we cover what a producer is, why they are helpful and necessary, the different stages of production, and important factors to consider when deciding who to hire. The entire guidebook is available online and included with a free membership to the AEA.