Some Other John Simons
The fellow you'll discover at johnsimonmusic.com is a guy with a big heart who, in the words of his website, “has worked with groups of children and young people as a youth worker, drug and alcohol counselor and teacher - usually bringing music into the mix! He has also been an engaging workshop leader and keynote speaker for groups of adult professionals.”
He also plays guitar, which I don't.
If that's who you're looking for, it was nice of you to visit, but go on and visit his site. Bye.
If you're looking for the famously caustic but inevitably deceased drama critic, you can find him on Wikipedia or in this helpful memoir: https://newcriterion.com/article/john-simon-19252019/
I met him at a NYC cocktail party once. My wife joked to him, “John's grandmother sees you mentioned in the New York Times and gets confused. Could you change your name?” He poured his drink on her. Good writer. Lacked social graces.
Searching for John Simon on YouTube might bring you to a football linebacker who played for the Baltimore Ravens and then the Houston Texans, the Indianapolis Colts, The New England Patriots, the Tennessee Titans and the Pittsburgh Steelers. Nice career.
If you are curious about British politics in the first half of the 20th Century, Viscount John Simon's name might turn up. It seems he had a certain lawyer's clarity-of-options but, sadly, he sometimes picked the wrong one -- like he didn't think Hitler would make much of himself. Wrong choice there, Johnny.
5, 6, 7 and beyond: Then there's a knighted British surgeon, other John Simon musicians who are so young that they were born after my producing career had already started to go downhill, a professional wrestler and a couple of pastors who speak languages that unfortunately I don't understand but which I assume/hope promote a message of peace. And more I'm sure.