> Why is it you feel that Bertrand Russell had mental health challenges?
Dim recollection from what I've read. But if you ask your favourite search engine for 'bertrand russell mental health' you'll get plenty of hits. Eg https://archive.nytimes.com/www.nytimes.com/books/01/04/29/r... or https://www.researchgate.net/profile/Michael-Fitzgerald-6/pu... or https://medium.com/young-polymaths/in-their-20s-bertrand-rus...
He also had quite the family history of madness (to use a contemporary term).
Yes, for Cantor it's a bit harder to say. We can definitely find enough environmental triggers.
(Not) coincidentally, I grew up close to whither they exiled Cantor.
> There are many many logicians and set theorists, only a few make the "whackiest intellectuals" list - I personally would class Russell as well balanced, Alonzo Church as quite sensible, Dana Scott as pretty solid, . . . etc.
Well, the problem is that no one on your list has an Umlaut in their name. If you want to do really important fundamental work, that's almost a requirement.
Jokes aside, Raymond Smullyan was also a splendid fellow who did important work. And, a magician (and concert pianist), too. Just to come back to the topic of the article.
https://en.wikipedia.org/wiki/Raymond_Smullyan