By the early 1990s, "core Vertigo titles had already become their own little enclave," so when Berger returned from maternity leave, she spoke with DC President Jenette Kahn and Executive Editor Dick Giordano, the outcome being a separate imprint to "actively expand [the sensibility" of the titles she had been editing. Berger included in the initial Vertigo line-up the five titles she had had some hand in creating or editing ("Swamp Thing", "Hellblazer", "Animal Man", "Sandman" and "Shade") as well as "Doom Patrol" which she "decided to include... because Grant Morrison was working on it and the sensibility was very much like the other series." Berger oversaw the entire Vertigo line, and was promoted to the position of "Senior Vice President — Executive Editor, Vertigo" in July 2006. Her promotion came as Vertigo was said to be equivalent to "the fourth largest American comic book publisher" in 2005, with Paul Levitz praising her personally as having "built Vertigo into an imprint which is simultaneously one of comics' leading creative and commercial successes." In addition, Berger won Eisner Awards for her editing in 1992, 1994 and 1995 for her work on the proto- and early Vertigo titles "Sandman", "Shade", "Kid Eternity", "Books of Magic", "Death: The High Cost of Living" and "Sandman Mystery Theatre".