Is there any difference between a Judge and a Commissioner?

Judges belong to the Judicial Branch of Government, while Commissioners are part of the Executive Branch. Judges exercise judicial authority; Commissioners, quasi-judicial. An issue is usually ped upon by Commissioners, which, in some jurisdictions can then be appealed to a Judge. A Judge can also refer a case to Commissioners. Judges are learned men of the law; Commissioners are usually administrators of a particular agency (like the SEC) and are deemed "experts" in that field, hence, they are allowed to decide on administrative cases regading their particular fields.