Dan Epstein, professor of political science at Colgate University studies Russian and Chechen politics can offer insights or answer questions on the connection between Chechen terrorists (whose major grievance has historically been with the Russian state) and the United States as a target.
Currently on Sabbatical from Colgate, Epstein is currently living in Boston, and can be a local source for you.
If you want to get in touch with him, please call 315 228 6637 or 716 289 8086.