MOVING TO FRONT--UPDATED
The following law schools (listed in rough order of strength of the law school overall--though these are all major law schools) have a strong commitment to philosophy:
University of Chicago
New York University
University of California, Berkeley
University of Pennsylvania
University of Michigan, Ann Arbor
University of Virginia
University of California, Los Angeles
Law school hiring is extremely pedigree-sensitive (more so than philosophy), so the further down this list you go for the JD, the more difficult your prospects will be in legal academia, though all these schools have graduates who now teach in law schools. (See, e.g., this data.) Yale, NYU, Berkeley, Michigan, and UCLA all have "top ten" philosophy departments, though with differing strengths. Chicago has a "top twenty" philosophy department, though its strengths are primarily in the history of philosophy (esp. ancient and post-Kantian Continental), which could be a good fit for a student with strong historical interests (including the Continental traditions in philosophy). Penn has an established JD/PhD program, and a philosophy department with particular strength in political philosophy, which could be a good complement for a JD/PhD student. (Columbia still has the great legal philosopher Joseph Raz on a half-time basis, though he in his late 70s, and I don't know how much longer he will continue to teach.)
UPDATE: A student writes:
Thanks for your recent blog post about schools for a JD/PhD in Philosophy. I am looking to apply shortly for philosophy PhDs (and I already hold a deferred JD offer, though may reapply elsewhere if necessary) so this was very interesting. If you don’t mind, I would be very interested to know your answers to a few questions I have.
Firstly, neither Harvard nor Stanford appear on your list. Both are top law schools with top philosophy departments, so I was wondering what your rationale was for not including them? They also seem to be amongst the few law schools to fund (or mostly fund) the JD component if one takes a JD/PhD (unlike, for instance, Yale) which seems like a fairly important selling point.
Secondly, what are your thoughts on taking the PhD at a different institution to one’s law school? It seems to be theoretically possible, and there appear to be some obvious benefits — NYU, for instance, has a great philosophy department, but there are much stronger JD programmes. Similarly, I could try to sandwich a JD between an Oxford BPhil and DPhil (if I was lucky enough to be granted funded admission; though — as I did very well in my philosophy undergrad [in the UK] — that is not a negligible possibility). Those are just hypotheticals; but do you think that there are good reasons to only take the JD and the PhD at the same institution?
Since others may have similar questions, I thought they would be worth addressing here.