We have an election that is currently live, looking for self-nominations.
Is there anyone you think should nominate themselves, that has not stepped forward yet? There is no official way to nominate others, and that user will have to nominate themselves to be considered. Still, if you have someone in mind, could you link their user page and say a few words about what you've seen?
See also A Theory of Moderation for details on how SE thinks about moderation, and possibly the original moderator nomination thread for this site.