Very similar to Palatino, but with smaller serifs and a few refinements:

http://www.myfonts.com/fonts/linotype/palatino/

Yeah, Palatino was my first thought until I started to compare them side-by-side.

Thanks for the reply, kthomps5.

Could have been a custom job by Joe Finocchiaro:
http://luc.devroye.org/fonts-39089.html

But I think Alan Fletcher is a better bet:
http://www.alanfletcherarchive.com/archive/corporate-identity

I also cycled through dozens of Palatino-like faces, and found no good match, so I'm betting it is custom.

I believe the Finocchiaro is the updated riff on Bankers Gothic:
http://www.joefino.com/Logo_html/L35_Arthur%20Andersen.html

Seems to me you are correct that it was a custom job by Fletcher.

Thanks for pointing me towards that!