How to Find Missing Fonts

Our firm is getting more and more demand for magazine design projects. My wife is a graphic designer and does all of the design and layout in Adobe InDesign on her two Macs running Snow Leopard. However, when I try to open the InDesign files on my new Mac running Lion, I get prompted for “Missing Fonts.” How can I get a printout of the fonts installed on my Mac, and how can I install the missing fonts that are present in Mac OS X Snow Leopard, but not in Lion? The font in question is Berthold Akzidenz Grotesk.