Mr. Holt's Wikipedia article is amazingly sparse.

As a young man, I went to see Will perform, alone or with Dolly, whenever he was in Chicago. He never disappointed.

I have the Elektra album and also Will Holt and Dolly Jonah on the Brink on Atlantic, which I suspect is even rarer.

Dolly Jonah died in 1983.

I have no idea what Mr. Holt is doing today, hopefully enjoying his retirement just as I am. He would be, I believe, about 81 or 82.