Historical clue formulations

• Washington or Berlin — 2026-04-12
• John who wrote "The Cider House Rules" — 2018-06-15
• John who wrote "The World According to Garp" — 2017-03-20
• Classic storyteller who wrote under the pseudonym Knickerbocker — 2014-09-13
• Songwriter Berlin — 2012-04-23
• With 21-Down, composer of 36-Across — 1999-03-25