Approximately 90
That's in the home office, in Dallas. There are satellite offices in a few other places, sometimes consisting of a single partner (or senior associate), others staffed in all three disciplines (MEP).
They're overwhelmingly a bunch of good folks. I turned down another offer to stay there, which says something about me, too: The bucks don't matter as much now as my former life forced them to. It matters more that I actually enjoy being there.
Got any hospitals you need a consultant for? I bet at least one of our PE's is licensed in Idaho...