Some of the things I like to read to stay sharp as I grow old.
For example this paper says how foreign born PHDs do location choices.
Graduates with stronger academic ability, measured by whether they received university support for a research or a teaching assistantship, had a 6.8 percent higher stay rate. Assistantships were the primary means of support for 52 percent of the sample; 11 percent of the sample was supported by a university fellowship or scholarship, which was associated with a 2.7 percent higher stay rate. Students supported by foreign funding, 4 percent of the sample, had an intent to stay that was 26.7 points lower.
As one would expect, ties to the United States are also important. Foreign-born U.S. citizens have a 19.5 percent higher stay rate; green card holders have a 15.3 percent higher stay rate; and U.S. college graduates have a 3.6 percent higher stay rate.