March 15th, 2015, 6:44 pm
If we eliminate Columbia from the list, one could (I think) reasonably rephrase the question along the lines of "what is the best math finance PhD program in the greater London area from the perspective of somebody who wants a job in industry?" This would seem to be reasonably well posed, subject to all the usual caveats about ranking multi-attribute alternatives and the general wisdom (or lack thereof) of pursuing a PhD for a non-academic career. Once you relax the geographical limitation, however, it is completely non-obvious why Columbia would be the first (let alone only) additional school to consider. If you specifically want to get a job in NYC, then Columbia, NYU and Princeton have locational advantages, and all have a pretty good reputation in math finance (and are difficult to get into). A little more background color on what you are really interested in doing (and where you would like to do it) would be helpful.