Universities attended by math PhD students at Harvard and UC Berkeley

On another thread I left a comment with some data I'd compiled about grad students in math at Harvard. I went through the list of grad students there and compiled the undergraduate universities for those that I could find. I'll copy the results over here, for ease (but see this comment for some updates to this from a Harvard PhD student):

I just went through the list of Harvard grad students. Of the 43 I could find information about (which is a large majority but not everyone), 25 did their undergrad in the USA and 18 did so internationally. The breakdown is as follows:

Domestic:

|University | Number| |:---------|--------:| |MIT |9| |Stanford |4| |Princeton |3| |Caltech |2| |Columbia |2| |University of Chicago |2| |Notre Dame |1| |University of Illinois Urbana-Champaign |1| |University of Washington |1|

And for international universities:

|University | Number| |:---------|--------:| |Cambridge [UK] |5| |University of Toronto [Canada] |3| |Chennai Mathematical Institute [India] |1| |ETH Zurich [Switzerland] |1| |Jacobs University [Germany] |1| |McGill [Canada] |1| |National Taiwan University [Taiwan] |1| |Sharif University of Technology [Iran] |1| |Taida Institute for Mathematical Sciences [Taiwan] |1| |Tsinghua University [China] |1| |University of Moscow [Russia] |1| |University of Pisa [Italy] |1|

Some further notes:

• There are only three people from what I'd consider domestic, non-elite undergrads. I know one of them was a huge prodigy.

• Many of the Americans did very well on the Putnam (Harvard's Putnam Fellowship probably doesn't hurt here), while many of the international students were IMO medalists. Of the Cambridge students, at least one was Senior Wrangler (single best student of the year, out of a couple hundred) and at least one more was like top 2-3.

• The people I couldn't find data on seemed disproportionately to have Chinese names, so China is almost certainly better-represented than my data makes it seem.

Anyway, I spent the past couple hours compiling the same data for UC Berkeley, and since I thought this might be quite interesting to people, here it is.

There are somewhere around ~190 or so Berkeley grad students (this is just an estimate). I found undergraduate university for 144 of them, around 75%. Of those 144, 106 went to US universities (74%) while the other 38 went to international universities (26%). Here's the breakdown:

Domestic:

University	Number
MIT	10
Stanford	7
University of Chicago	7
Princeton	6
UC Berkeley	6
Brown	4
Caltech	4
Harvard	4
Columbia	3
Harvey Mudd	3
NYU	3
Northwestern	2
Notre Dame	2
Oberlin	2
Purdue	2
San Francisco State	2
University of Colorado Boulder	2
University of Pennsylvania	2
University of Rochester	2
University of Texas Austin	2
University of Washington	2
Williams	2
Arizona State	1
Calvin College	1
Carleton	1
Cornell	1
Drexel	1
Duke	1
East Carolina University	1
Grinnell College	1
Hofstra	1
Howard	1
Hunter College	1
Oklahoma State	1
Penn State	1
Pomona	1
Reed	1
Rutgers	1
SUNY Cortland	1
UC San Diego	1
UC Santa Cruz	1
UCLA	1
University of Dayton	1
University of Illinois Urbana Champaign	1
University of Michigan	1
University of Minnesota	1
University of the Pacific	1
Wesleyan	1
Yale	1

And the internationals:

University	Number
Waterloo [Canada]	4
Cambridge [UK]	3
Korea Advanced Institute of Science and Technology [South Korea]	2
Nanyang Technological University [Singapore]	2
Peking University [China]	2
Toronto [Canada]	2
Zhejiang University [China]	2
Ecole Polytechnique [France]	1
Edinburgh [UK]	1
Hanoi University of Sciences [Vietnam]	1
Hanyang University [South Korea]	1
Hong Kong University of Science and Technology [Hong Kong]	1
Lahore University of Management Sciences [Pakistan]	1
McGill [Canada]	1
Moscow Institute of Physics and Technology [Russia]	1
Nanjing University [China]	1
Nankai University [China]	1
National University of Colombia [Colombia]	1
Oxford [UK]	1
Seoul National University [South Korea]	1
University of Brasilia [Brazil]	1
University of Bucharest [Romania]	1
University of Helsinki [Finland]	1
University of Melbourne [Australia]	1
University of Science and Technology of China [China]	1
University of Tehran [Iran]	1
University of the Chinese Academy of Sciences [China]	1
University of Warsaw [Poland]	1

Some notes on this:

• Berkeley has people with a wide range of backgrounds. There was somebody who'd taken about 30 years in industry and was only just going back for his PhD. There were people who hadn't majored in math for undergrad. And, of course, there's a far wider ranger of universities than there is at Harvard.

• A few people at some of the lower-ranked domestic universities had done masters degrees at higher-ranked places. A nontrivial number of people had also done Part III at Cambridge.

• High scorers on the Putnam were still to be found, but not nearly as abundantly as at Harvard. As with Harvard, however, many of the international students had IMO experience. Given also the relative number of domestic vs international students at Berkeley, I suspect the bar for internationals is rather higher than for domestic students.

One final note: Columbia publishes data about their incoming classes here, so it would be relatively easy to compile the same data for Columbia. I would take maybe the last five years worth of incoming classes, which is probably approximately the makeup of their grad students. I'll leave that for someone else to do.

If anyone has the stamina to do this for another university, I think MIT and Stanford could be quite interesting. Princeton would be interesting in the sense that I strongly suspect that a majority of their grad students are from either MIT or Harvard.