Recently on the fora at the Chronicle of Higher Education, someone with tenure, I think in a STEM field, and on the math-ier end of it at a guess, was wondering whether it would be worthwhile to get a second Ph.D. in a related field. Commenters urged him (her? unclear, but I had the impression it was a guy) to just read and do research in that field, although it sounded like he really wanted to have the immersed experience of Ph.D. level courses. I’m not so sure how he felt about a second dissertation, though since math/comp sci dissertations can be short, and/or can assemble a batch of articles you’ve published already, that doesn’t seem so hard.
Anyway, I was somewhat surprised at the way commenters piled on, wondering why anyone would ever go through a second Ph.D. experience. It’s obvious to me: if I won the lottery, I would absolutely get a second Ph.D., in Classics this time. I’d have to start by learning ancient Greek, so I might need to start with a second B.A., but the necessity of learning Greek is, to me, a feature, not a bug. And for the purposes of language-learning, classroom immersion is about 95% necessary. There are some gifted, disciplined people who don’t really need it, and a lot of us have picked up one or more medieval languages by hammering away with a grammar and some texts, but for a really strong grasp, you need a lot of time, a lot of exercises, and a good teacher.
It’s true that I am not contemplating doing this while holding my tenured position, nor as a means to improve my current position or research ability (though it would certainly expand the areas I could research, and give a different perspective on what I work on now). I probably won’t even do it in retirement (well, maybe the second B.A.), because I have so many medieval research projects in mind already, and I’d like to make sure I get them done. The “winning the lottery” point is that I could pay my way wherever I wanted to go.
One of my colleagues actually did get a second Ph.D., while continuing to teach in our department, in a related field. Basically, it took up his research time for a few years, and I’m pretty sure one sabbatical leave went to the required coursework. His second dissertation was a well-regarded book. So it can be done, and there can be good reasons to do it.
What about you? If there were world enough and time (and money), would you go back? In a related field, or something really different? Why, or why not?