I went to Bill Cairo and was seen by his son Joe. It wasn't clear to me if the father is still working there, and I didn't want to ask because I thought it might seem rude - as in "you're just the son - where's dad?"
Joe was very nice and professional, and to his credit he turned away my business rather than work on a suit jacket he felt he couldn't fix well.
But when I asked about the way his shop works he said they have tailors "working for us."
So it wasn't clear to me if Joe, the-son-of-bill, is a tailor himself as well, or just the guy handling clients and running the business end of things.
If anyone has clarification I'd appreciate it. It makes me nervous having a non-tailor examine my items and make judgment calls. On the other hand they seem to have a stellar reputation so I guess it shouldn't matter.