A few months ago I asked for a referral on a collection agency.  Nobody on the list had any suggestions, probably because you just send out your big brothers with a baseball bats.

 

Having only two big sisters, I have used the firm below, and they have been completely professional, and quite helpful:

 

Mark Zanders
Performance Source II, Ltd.
5233 N Elston Ave, Suite 201
Chicago, IL  60630-1642
 773 / 205-8000   ext.202

 

They take a third.  In my case, it was money well spent.  My sisters play tennis. 

 

Christopher