Membership Directory Filter by Extended Profile Fields

I am using the BuddyPress membership directory here: http://tacr.wpengine.com/members/
I want to add a "Filter By" dropdown option so members can choose a profile field like Attorneys or Bankers and just see all of the lawyers or bankers. Is there a plugin for that? Or do I need to modify the code on the member directory page? Any suggestions on how to do that?

Thanks!