I guess it could be from law school days, but it still seems odd to me that they would be included in a picture for a company banner. The cronyism part I get.
It's not exactly a formal banner; looks like something they'd rig out for a party or a picnic. Besides, these guys own the law firm, they can do what they please. As of now, Greer and Demers, in that order, are big political pluses on the banner. This is a law firm that has waded deep into politics throughout its history.