rapporteur(a person appointed by a deliberative body to investigate an issue or a situation, and report back to that body) noun [UK: ˌræ.pɔː.ˈtɜː(r)] [US: ˌræ.pɔːr.ˈtɝːr]
speaker [speakers](one who makes a speech to an audience) noun [UK: ˈspiːkə(r)] [US: ˈspiːkər]