If you're a member of a group that's officially (sometimes publicly) discussing a specific subject, you're a panelist.

Most panelists are either experts in the subject being discussed, or people whose lives are affected by related issues, developments, or changes. A group of panelists is called a panel, which comes from the Old French, in which it means "piece of cloth," and an Anglo-French legal meaning, "piece of parchment listing jurors." Panelist is an American English invention from about 1950.

Definitions of panelist
  1. noun
    a member of a panel
    synonyms: panellist
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    juror, juryman, jurywoman
    someone who serves (or waits to be called to serve) on a jury
    the presiding member of the jury and the one who speaks on their behalf
    petit juror, petty juror
    a member of a petit jury
    type of:
    anyone who expresses a reasoned judgment of something
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