Highlighting Threads by Author's User Group

[greytone]

I want my thread list in each sub-forum to emphasize threads that were created by Administrators. For instance, have their name in red.

It would make sense to edit the memberaction_dropdown template because this is where the user names are printed, but I can't figure out what conditional statement to write. Any suggestions?

I already have the posts within a single thread doing custom styling on the username, but this doesn't affect the list of thread in a forum.