Just want to clairfy this a little-
Joe Grado is still alive, he was the founder of Grado Labs. His brother Angelo, who has nothing to do with the audio business, died at the age of 92.
Angelo's son, John Grado is the one that took over Grado Labs and is the creator of all the newer Grado headphones. Jonathan Grado, who made the facebook announcement, is John's son and Angelo's grandson. When he talked his grandfather's passing, he meant Angelo Grado.
There have been many internet articles announcing Joe's death, which is not correct.