 Of these types, the acrostic has the longest and most interesting history, beginning on May 9, 1943, authored by Elizabeth S. Kingsley, who is credited with inventing the puzzle type, and continued to write the "Times" acrostic until December 28, 1952.From then until August 13, 1967 it was written by Kingsley's former assistant, Doris Nash Wortman; then it was taken over by Thomas H. Middleton for a period of over 30 years, until August 15, 1999, when the pair of Cox and Rathvon became just the fourth author of the puzzle in its history.The name of the puzzle also changed over the years, from "Double-Crostic" to "Kingsley Double-Crostic," "Acrostic Puzzle," and finally (since 1991) just "Acrostic."