Historical clue formulations

• Author's assistant — 2025-06-01
• One with key responsibilities? — 2021-08-07
• Key figure? — 2014-11-21
• Author's assistant — 1999-05-04
• Temp, often — 1998-02-26
• Key employee? — 1997-12-03
• Keyboard whiz — 1997-10-10
• One in a pool, perhaps — 1994-06-26