There's two Rules Marshals who attend (and post) infrequently that do not have avatars, because of work-related concerns (i.e. - their jobs don't let them appear anywhere online in an identafieable manner). The only other common staff member to post hasn't seen a camera because he's been too busy at events running them - although we're trying to fix that.

As soon as we have a good pic, I'll make an Avatar for him.
A new feature I recently added is the ability to see who is in what groups easily by clicking on the Members list, and choosing "Search by Position" (or you can click:
www.knightrealms.com/forums/index.php?action=mlist&sa=position
to see it). This should give you a quick idea of who does what, in addition to the list under their avatar on the forums.
("Staff" are technically every kind of Marshal, but we don't list them, otherwise every post would have a litany of titles under it.)