TAX help ASAP!!

Ok, here goes I live in NH, I have a friend (ex ) that lives in NH and works in MASS.
We have stayed fairly friendly over the past years due to the children.

I just found out last night by him that he has not filed taxes for almost 10 years
so I am trying to find a Tax attorney or a CPA firm, preferably the cheaper of the 2..

Reason he came forward to me is because his salary has been garnished
and he thinks child support will be reduced, I told him child support
 
will not be affected UNLESS he goes to jail !!

So does anyone in MASS know of a firm near the REVERE area?
Again he lives in NH and works in MASS, could he hire a firm in NH?
I don`t know why I bother to help other then he is my childrens father.

Thanks in Advance!!