In the United States, a parliamentarian is an expert on parliamentary procedure who advises organizations and deliberative assemblies.
This sense of the term "parliamentarian" is distinct from the usage in parliamentary republics and monarchies as a synonym for member of parliament (a clerk may advise the chair or members on parliamentary procedure in these jurisdictions).
[7] Other responsibilities may include teaching classes or holding office hours during conventions.
[9] At meetings, the parliamentarian should unobtrusively call the attention of the presiding officer to serious errors in procedure.
[12] In other words, the parliamentarian should ordinarily not be making motions, speaking in debate, or voting.