Swartz & Swartz, P.C. 10 Marshall St, Boston, MA 02108 (617) 742-1900 http://www.swartzlaw.com. Headquartered in the historic John Hancock House in Boston's Freedom Trail, the Massachusetts personal injury lawyers at Swartz & Swartz, P.C. handle all claims arising from personal injury accidents, car accidents, product liability, medical malpractice, and many other practice areas.