panelist
A participant in a panel discussion or a member of a panel, typically in a conference, TV program, or academic setting.
彼は国際会議のパネリストとして招待された。
He was invited as a panelist for the international conference.
The panelist gave an opinion on the TV program.
We invited three experts as panelists.
She spoke as a panelist at the symposium.
He was chosen as a panelist for the TV program.