I understand he was a worker in Brazil; more can be found about him here: http://movimentodosirmaos.blogspot.com/p/stuart-edmund-mcnair.html (Chrome should offer to Auto-Translate the page).
I put up a photo of H D'A Champney the other day, one of which was with an 'Eric McNair' who I think is a nephew.
I would definitely liken the photo of McNair from 'Round South America' to the two shown above - just a younger vintage IMHO
Moises asked:
Hello. I would like to understand if McNair's movement in Brazil has any relationship with Bruce Anstey and Mario Persona? For there seems to be a division between these and those, how can I find out, what should I read?
Dear Moises, aged brother Bruce Anstey is associated with the 'Tunbridge Wells' brethren in Canada and USA and has the same roots as McNair. He has written many helpful books (which I distribute on my bookstalls, although I cannot agree with all his conclusions). The unhappy causes of the TW division are well-documented on this website.