Upon further investigation it turns out that are two more fences in Lincoln Park that have heads from the Garrick theater. So besides the ones on Dearborn on this clip we have heads from the 2100 block of north Lincoln and the 2400 block of Geneva Terrace. If you have a healthy pair of legs and a couple of hours you can stroll around this lovely area and see them all. By the way the sculptor of these was Richard Bock.
As for who they are well that's another story one that is told on The Errant Inquisitor site. Where you will find the whole story this guy (I'm guessing) did a lot of research so I'll let him tell you the story.