Who's Who was the creation of Len Wein, Marv Wolfman, and Robert Greenberger, and its first incarnation (Who's Who: The Definitive Directory of the DC Universe) debuted in the last month of 1984 (cover dated March 1985) and ran 26 issues until 1987 (cover dated April 1987). It was essentially an encyclopedia in comic book form, listing the characters, places, and things in the DC Universe. It began one month before the 12-issue limited series Crisis on Infinite Earths began, and therefore it is of interest to note that the earlier issues discuss pre-Crisis versions of the characters, whereas issues released subsequent to the conclusion of the limited series discuss the post-Crisis universe. For example, while both the Flash (Barry Allen) and Supergirl died during the Crisis, the Flash's de