Rosenberg's first project was a dance film commissioned by Paramount Pictures that was ultimately never made. She then shifted to television writing. She first wrote for Class of '96 in 1993, and went on to work on shows including Dr. Quinn, Medicine Woman (1995â1996), Dark Skies (1996), The Magnificent Seven (1998), Ally McBeal (2001) and Birds of Prey (2002) before she came to join the writing staff of The O.C. in 2003. Leaving The O.C. at the conclusion of its first season, she was hired to write her second screenplay, the 2006 dance film Step Up
. (Later, she was also offered the job of writing the sequel, Step Up 2 the Streets, but turned the offer down as she was busy with other projects.)
Rosenberg went on to write for the television series Love Monkey (2006) and Dexter (2006âpresent). Her job on Dexter, which is broadcast on Showtime, was her first on a show written for cableâshe stated in 2007, "Cable is the place to be ... it's just wonderful." Rosenberg initially worked as a consulting producer and writer on the first season. She and the other members of the Dexter writing staff were nominated for a Writers Guild of America Award for best Dramatic Series at the February 2008 ceremony for their work on the first season. She gained a staff position as co-executive producer and writer for the second season in 2007 and continued in this role for the third season in 2008. The writing staff was again nominated for the WGA award at the February 2009 ceremony for their work on the third season. As part of the senior production team she was also co-nominated for the Outstanding Drama Series award at the 60th Primetime Emmy Awards. She was promoted to executive producer for the fourth season in 2009 and continued to write episodes. She was nominated for the WGA award a third consecutive time at the February 2010 ceremony for her work on the fourth season of Dexter.
Rosenberg at the 2008 Screenwriting Expo
Summit Entertainment, the production company which had produced Step Up, offered Rosenberg the chance to adapt Stephenie Meyer
's bestselling novel Twilight into a film of the same name, which she accepted. Her primary inspiration for the adaptation was Brokeback Mountain
, which she described as a "great model" of forbidden love alongside Romeo and Juliet, and thought its adaptation from short story to film was "beautiful". She was given a "manifesto" written by Meyer outlining everything that had to be included or could not be changed in the adaptation. She wrote a detailed 25-page outline in August 2007, expecting to have another two months to write the actual screenplay, but had only five weeks to finish the script before the commencement of the 2007â2008 Writers Guild of America strike. After the release of Twilight, she was hired by Summit to adapt the sequels New Moon and Eclipse, the second and third books in the series, respectively, and she had already begun drafting the New Moon screenplay by November 2008.
In July 2010, Rosenberg left her role of writer and executive producer on Dexter, explaining that "For the past four years I've been writing Dexter and one Twilight or another." She had been hired to adapt the final novel in the Twilight series, Breaking Dawn, which would be split into two films, but she said, "I can do one Twilight and Dexter, but I couldn't do two." She was regretful about leaving the series and called it her favorite television experience to date. She has recently signed on to write the script for a relaunch of the Highlander
film franchise, with Justin Lin
(Fast Five) directing.