Who owns and operates the Mount Graham VATT telescope in Arizona USA?

It must be a blessed telescope, because it's operated by the Vatican Observatory, in partnership with The University of Arizona. This gives new meaning to the term, "Holy See!"

VATT is an acronym for Vatican Advanced Technology Telescope. This is a Gregorian telescope, designed by Scottish mathematician James Gregory in the 17th century, rather than named after one of the popes. The telescope operates in the visible and infrared spectra.

The observatory and telescope were built in 1993 and are situated on Mount Graham in the southeast of Arizona.

https://en.wikipedia.org/wiki/Vatican_Advanced_Technology_Telescope