I could be mistaken, but last I knew (only a year or two ago) he was still making cues in MT. I have his information at home and will try to send it to you later.
Jack refinished and made a new shaft for a cue of mine a few years ago, and I could not have been happier with work in terms of quality, price, and time to completion. I think it's a little easier to get a hold of him by phone than email.
Don't dawdle. If there is a question about how long he will be making cues, get it done before he stops. I have only played with one of his cues and it was great.
They don't come any better than John Madden Cues.
You may want to PM member Saint1, as he has
some nice Maddens for sale. Also contact Michael
at TM Cue Sales for Maddens.