Did you ever figure it out? It seems like you did judging on the link you posted. But for people who need this code, here is what I did for mine.
Before you start the loop, you need to do a query and define the author per column (author_name=author1). Also make sure to check the name of the author is correct. I made this mistake and coudln’t figure out why it wasn’t filtering posts by author correctly.
[Code moderated as per the Forum Rules. Please use the pastebin]
