Historical clue formulations

• Eisenhower and Nixon biographer Stephen — 2015-05-15
• Cynic Bierce who once defined "alone" as "in bad company" — 2014-01-26
• Cynical Bierce — 2009-12-15
• Historian Stephen — 2002-04-05
• With 43-Down, author of the definition — 2002-03-13