GW's website shows placement statistics by region. While most grads stay in the DC area, a fair number head north to Philadelphia and New York. I'm sure they go to Boston as well.
Another good resource is the NALP directory (nalpdirectory.com). Do a browse of Law Firms in Boston and narrow your search to those that conduct on-campus interviews at George Washington.
They're both great law schools, and I'm sure every lawyer on the East Coast is familiar with the strong reputation of both schools, though admittedly they aren't T14. You may need to door more legwork to go where you want.