Mr. Borchardt, an urbane and debonair man whose wry observations came with a slight French accent — a remnant of his upbringing in Paris — had an astute eye for literary talent. At various times, he or the Manhattan agency that he and his wife, Anne Borchardt, founded in 1967, Georges Borchardt Inc., represented five Nobel laureates, eight Pulitzer Prize-winners and one statesman, the French president Charles de Gaulle.