This is indeed, very sad news! I had wondered why I had not heard from him in a while. He had invited me out to his home twice to tune the Mason & Hamlin RBB. I made a tuning file for him so he could reproduce the tuning at will. Patrick Wingren (ppppat) of Finland was along on the second trip and made some recordings.
GP had always kept his identity secret on here because he did not want Google picking up on snarky comments and mixing them up with his professional career. I wonder now if it would be proper to reveal who he was? If so, there are You Tube videos of him performing. They are amazing! I took a trip to San Francisco once just to see him perform.
I can say this: he didn't have much of a family left. I believe both of his parents were deceased long ago and his wife died of cancer several years ago. I believe he is only survived by a daughter. Whether she is married and there may be any grandchildren, I do not know.
While GP was a professional musician and did well in his career, he had never actually learned to play the piano but loved the instrument. That lead him to acquire the Mason & Hamlin RBB which he had fully restored. One of the bedrooms in his house was actually a library of piano rolls, stacked from floor to ceiling in many book cases.
He also had a parallel RX system installed that reproduced artists flawlessly. There was never any mechanical noise from the system. Even I, as a piano technician, forget that recordings made are not from a live pianist, they are so realistic. No clunky, jerky, player piano sound to them.
He also had one of those machines, I forget the name of them, that plays a large, metal round disc with holes in it. A giant music box, as it were. I think those may have actually preceded the player piano roll as the first digital technology. It was beautifully restored and he had many discs to play on it as well.
GP enjoyed having friends and neighbors over for dinner parties and to listen to music played on his piano. While he was also a good cook, he often had his next door neighbor do the cooking for such events so that he could be a good host.
GP joined this group essentially because whenever he wanted to play his piano, he wanted it freshly tuned. It was not that he couldn't afford to have a technician tune it whenever he wanted. It would have been that such a technician would have to actually live there and tune nearly every day that GP was home from one of his tours. So, GP wanted to learn to tune for himself and he did an exceptionally fine job of that. His unisons were the most perfect I have ever heard.
GP was also a testimony to the fact that non-equal temperaments can work on the modern piano for virtually all kinds of music. He had a very fine ear. He had to, in order to be able to do his work. He had become intrigued with all of the discussion there was about non-equal temperaments and invited me to his home to try them out. If there were ever anyone who might say, "That does not sound right", it would have been him. Instead, he embraced the sound and wanted it more often than not. He certainly knew what a key signature was and the value of it.
Here is a link to my Boxnet account (safe to click, no danger of malware or viruses) of Debussy's "Claire de Lune" played on his Mason & Hamlin RBB in a non-equal temperament. It was actually the first piece he tried. Written in 5 flats, it shouldn't actually work if all conjecture were really true but as GP discovered, it did work and it actually enhanced the sound.
It was actually GP who told me that Boxnet was a great place to store and to share files.
https://app.box.com/s/q7vosp2amts8b83kuy8t 
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