Historical clue formulations

• "___, Escher, Bach" (Pulitzer-winning book) — 2017-06-18
• Co-winner of the first Albert Einstein Award, 1951 — 2010-01-30
• Mathematician famous for his incompleteness theorems — 2008-01-11
• Formulator of the incompleteness theorems — 2006-08-12
• Mathematician Kurt — 2004-12-01
• "Incompleteness theorem" formulator — 2002-12-06