Recusal requirement: adjudicators must step aside for personal ties or prior involvement; reasons may remain confidential. Recusal obligations require a President or Member to withdraw where impartiality may be compromised by personal, familial or professional relationships, prior involvement in the matter in another capacity, or other circumstances making participation inappropriate. The recusing officer may record reasons for recusal, but parties and others have no right to know those reasons, preserving confidentiality while upholding procedural integrity.