Joseph Esposito has published "An Interview with Jeffrey Beall" in The Scholarly Kitchen.
Here's an excerpt:
[Beall] In the scholarly open access segment of the scholarly publishing industry, we are seeing that the most prosperous publishers are the larger ones, those able to offshore their production work. Hindawi (in Egypt) and MDPI (with most of its work done in China) are two examples. I think the industry will continue to select for publishers like these, meaning many production-related jobs in North America and Europe will move to South Asia and East Asia.