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Jun 8, 2019 at 19:18 comment added user109595 The downside assumes you care much about your "career". In my country, aome motivated e.g. high school teachers do PhDs besides their work out of fun -- not because they want to do research in this field for the rest of their lifes.
Jul 14, 2016 at 14:26 comment added Maxim.K "obtaining a PhD is a small step along that career path": I'd have to disagree, actually, at least for certain cases. If you have a PhD in, say, sociology, and you obtain a PhD in statistics to support your research, that is by no means a small step. In fact, this would boost one's career quite a bit, even outside the original field.
Jun 11, 2015 at 14:05 comment added sean @DaveClarke I have no idea, I just happen to know such a case. I would imagine his first PhD supervisor was not happy at all, but somehow he could do that.
Jun 11, 2015 at 13:40 comment added Dave Clarke @qsp: Ooooo. But why?
Jun 11, 2015 at 13:13 comment added sean @DaveClarke In the UK, you can get two PhDs in the same field (at least I see one case in Computer Science).
Feb 22, 2013 at 3:30 comment added Luke Mathieson @Nasser, I've never seen a case where it was cut so fine as different fields of engineering. I've seen a physicist move to philosophy, so obtained PhDs in both. The decision whether to allow enrolment in the second PhD seems to be a judgement call by the university where the criteria is that the research is sufficiently different that the candidate would, in a sense, be "starting again" - so their prior PhD is in theory no advantage. Again though, it's up to the institution. Of course no of this applies to higher or professional doctorates.
Jun 11, 2012 at 4:10 vote accept Bravo
Jun 1, 2012 at 15:09 comment added Dave Clarke I think the answer is "it depends". Not me, that's for sure.
Jun 1, 2012 at 14:10 comment added Nasser What do you mean by "same field"? For example, how about Mehanical engineering and aerospace engineering? or ME and EE? It is not clear to me how "same field" is defined. After all, most degrees in field of physics and engineering are based on same core equations and fundamentals (For example, in M.E. we use F=ma, and also the physics students use the same equation, does this mean one can't have a PhD in Physics and a PhD in engineering?). And who decides if the field is the same or not?
Jun 1, 2012 at 8:35 history answered Dave Clarke CC BY-SA 3.0