Looking for node revision author token
For D7, in order to gain access to revision:author tokens, you have to install Revisioning module. (of course you also need token module)

Then you can see all the available tokens by going to Help -> Token (/admin/help/token)

So after enabling the module, a new token category, named "Revisions", is available. You can see for example 
[revision:revision-author] which refers to "The author (or editor) of the revision" and a bunch of others regarding the revision author. 

P.S. As per this there seems to be currently a bug regarding [revision:revision-author:mail]

Good luck and let me know if you need more help!