Every day, when Charles Barber comes home from teaching at Wesleyan, he starts what he calls “his second shift.” After a short nap, he settles down to reading, research, and writing, a disciplined practice that has allowed him to be, over the past several years, a prolific nonfiction author. Since 2019 Barber has published three substantive works and has more ideas in the pipeline. “I wish I’d started (writing) earlier. I had done some other things—I was working in the mental health world, and I was proud of what I did. I am now trying to get as much done…