FYI, if he is truly exempt (and I have my doubts from your description), he could be required to work 168 hours a week (169 hours this week since we're changing the clocks) and he would not be owed a penny of overtime. That's what exempt employees are exempt FROM - overtime pay. And MA, along with 47 other states, has no legal limit to the number of hours an employee can be made to work as long as he is paid properly.
However, I suspect that he does not really qualify as exempt. Your brother should investigate the attached link.
http://www.mass.gov/ago/doing-busine...complaint.html
BTW, as a non-exempt worker he can still be required to work as many hours as the employer requires - it's just that he would have to be paid time and a half for any hours over 40 in a week.

