Borstein trained in improv at the ACME Comedy Theater, where she met her writing partner and future husband Jackson Douglas. Shortly after they began working together on theanimated series Casper and Pinky and the Brain, Borstein left her position at an ad agency – where she had written print ads for Barbie – to become a full-time writer. In 1996, while still writing for Casper, Borstein worked on the show Power Rangers Zeo as the voice of Queen Machina, the queen of the Machine Empire.
In 1997, Borstein became a cast member on the third season of the sketch comedy show MADtv. She originally joined the cast as a featured player, but was upgraded to the repertory mid-season.
Borstein was perhaps best known on MADtv for her character Ms. Swan; her other recurring characters included Eracist Anne, "Stick Chick" Echo, singer Jasmine Wayne-Wayne, child prodigy Karen Goddard, lounge singer Shaunda, News at Six outside-the-studio reporter Sue Napersville, and Cordo the GAP troll. When Seth Green made recurring appearances on the show as mean boss Mr. Brightling, Borstein would play his mother, Mama Brightling.
While working on MADtv, Borstein met Seth MacFarlane, who was then preparing to launch the animated sitcom Family Guy on FOX (MacFarlane was originally supposed to create animated shorts for MADtv, but declined in favor of creating an independent series). MacFarlane cast Borstein as the voice of key character Lois Griffin. After the show's debut in January 1999, Family Guy was cancelled by the network in 2002 but returned in 2005; as well as her role as the voice performer for Lois and several other characters throughout the series (including a brief appearance as Ms. Swan in a 2005 episode), Borstein is also aproducer and staff writer. She has made at least three guest appearances, once as Lois Griffin, on the Comedy Central animated program Drawn Together.
In 2000, Borstein was cast as Sookie St. James in the WB drama Gilmore Girls. She portrayed Sookie in the pilot, but her MADtv contract prevented her from continuing in the role, which was recast with Melissa McCarthy. Borstein made recurring appearances on Gilmore Girls throughout the show's run, first as the harpist Drella.
As an actress, she has made appearances in such films as Killers and Dinner for Schmucks. She played the school principal in The Lizzie McGuire Movie, the best friend of Halle Berry's character in Catwoman, and an employee at CBS News in Good Night, and Good Luck. She also had an uncredited cameo in the Will Ferrell movie Kicking & Screaming as an obnoxious coffee shop patron. She also had a small role in the movie Bad Santa. On some commercials, she sometimes voices Olive Oyl from Popeye and Betty Boop. She also had a minor role in the film Ted, in 2012.
Borstein was a co-host of GSN's Celebrity Blackjack in 2004. In addition, she also appeared as a comedian contestant on IFC's short-lived, comedy-driven game show Bunk in 2012.
Borstein was cast as a press secretary in the 2007 sitcom pilot The Thick of It, but the series was not picked up for broadcast. She was seen in the 2009 comedy For Christ's Sake, which was directed by her real-life husband Jackson Douglas.
In 2010, Borstein joined the first season staff of the Showtime comedy-drama Shameless, as a writer and supervising producer. In its second season she held the position of writer and consulting producer. She also guest starred in the first season episode "But at Last Came a Knock", as Lou Deckner.
Borstein's production company is called Crackerpants, Inc. In 2007, they released the DVD Drop Dead Gorgeous (In a Down-to-Earth Bombshell Sort of Way), a recording of a live performance at the Alex Theatre, with opening act Teddy Towne. The title comes from one of many actual female character breakdowns Borstein reads from to illustrate sexism in the industry.
Borstein was nominated for a Primetime Emmy Award for Outstanding Voice-Over Performance for her Family Guy episode "Lois Comes Out of Her Shell" (2013). Borstein is currently appearing in an American version of the comedy Getting On; the series has gained positive reviews.
250th episode of ‘Family Guy' airs Sunday night, May 3rd at 9:00pm on FOX.
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