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- The program Charmed, from 2000 to 2004. She began as a story editor and became a co-producer of the show.
- The Fox program Wonderfalls, which aired in 2004. Vernoff was a writer and producer for the show.
- Vernoff has also written one episode for long-running drama Law & Order - (season 10, episode 14, "Sundown").
- She has co-written the crossover episodes of Private Practice - (season 2, episode 16, "Ex-Life", season 3, episode 11, "Another Second Chance").
- She was recently a Co-Executive Producer and then Executive Producer on the Showtime series "Shameless."
In 2019, Vernoff joined other WGA members in firing their agents as part of the WGA's stand against the ATA and the unfair practice of packaging, publishing a letter outlining her decision and reasons for supporting the guild.
Vernoff is best known for her time as a member of the creative team at the popular drama Grey's Anatomy. She is credited as an executive producer, and has also written episodes of the show. An episode Vernoff wrote, "Into You Like a Train", was nominated for a Best Writing Emmy Award.
Vernoff is credited with the introduction of the catchphrase, "seriously" into the dialogue of Grey's Anatomy episodes. Series creator Shonda Rhimes says that Vernoff used it frequently in the writer's room, and "said correctly, it can convey sarcasm, dismay, disbelief, a sense of moral and ethical superiority, and gentle chastising punishment, all at once."
According to Vernoff on the Grey's Anatomy iTunes Podcast, the episodes "Six Days Pt. 1 and 2" were written as a dedication to Vernoff's father, Bob Verne, who died in much the same way as Dr. George O'Malley's father in the series.
In May 2007, ABC announced that Vernoff would become showrunner and head writer of Grey's Anatomy effective fall 2007. Vernoff left her position with "Grey's Anatomy" in 2011. On April 28, 2017, she announced that she'd be returning to Grey's Anatomy for season 14.
Vernoff is also a playwright; a production of her play "Me, My Guitar, and Don Henley" opened in October 2006 in an off-Broadway theater.
- Andreeva, Nellie. "Writers Share Signed Termination Letters As Mass Firing Of Agents Begins After WGA-ATA Talks Fail". Deadline.
- "'Grey's Anatomy' Boss: Why I Left My Agent, Despite the Sales Pitch". The Hollywood Reporter.
- Rhimes, Shonda. "Grey's Anatomy Frequently Asked Questions Answered by Shonda Rhimes". ABC Television. Archived from the original on January 2, 2007. Retrieved 2007-01-20.
- Hollywood Reporter, Grey's shifts for Vernoff, Noxon http://www.hollywoodreporter.com/hr/content_display/television/news/e3iaf82321e51c9ae09a55c8263388d21aa
- Stanescu, Saviana (2006-10-08). "Me, My Guitar and Don Henley". nytheatre.com. Archived from the original on 2007-01-20. Retrieved 2007-01-20.