Is there any clear evidence as to how Dr. MacKenzie and Perry Maxwell first met, and how/why MacKenzie invited Maxwell to collaborate with him? I've seen something online that says they met 'when Maxwell visited Scotland in 1919': this is too vague to be trusted without further corroboration, especially since MacKenzie didn't live in Scotland (he might, of course, have been there on business or holiday, but as I said, further corroboration needed). I don't have Chris Clouser's book to hand.
thanks
Adam