Joyce Dewitt

DeWitt began appearing on stage at the age of 13. She earned a Bachelor of Arts degree from Ball State University. Subsequently, while she was performing in summer stock, the director convinced her to enroll in UCLA's Department of Theater MFA program, where she was awarded the Master of Fine Arts Fellowship as well as the Clifton Webb Scholarship. While attending UCLA, she worked as a secretary until her television debut on an episode of Baretta. Contrary to rumors that she was mentored by actor Abe Vigoda, Dewitt has said that the two never met.

DeWitt is best known for her role as Janet Wood during the 1977–1984 run of the sitcom Three's Company, a job she obtained after being cast in the show's second pilot. She also played Janet in a 1979 episode of the spinoff series The Ropers.

After Three's Company ended in 1984, DeWitt appeared in an episode of Finder of Lost Loves in 1984, after which she quit acting for several years. She resumed acting with a part in a production of Noises Off at Michigan's Cherry County Playhouse in June 1991. She later appeared in the 1995 TV comedy film Spring Fling! A character based on her, voiced by another actress, appeared in a 1997 episode of Pinky and the Brain. She made an appearance in an episode of Cybill, and had a cameo on the penultimate episode of Living Single. Her 2000s works includes TV shows such as Hope Island, The Nick at Nite Holiday Special and Call of the Wild.

DeWitt co-produced and hosted the 2003 NBC-TV television film Behind the Camera: The Unauthorized Story of Three's Company. In the film, DeWitt is portrayed by Melanie Paxson.

In 2008, she appeared in the indie film Failing Better Now. In 2009, DeWitt starred in a stage production of Married Alive in Calgary, Canada.

In June 2011, DeWitt succeeded Eve Plumb in the title role of the play Miss Abigail's Guide to Dating, Mating & Marriage at the Downstairs Cabaret Theatre in New York City's Times Square.

In 2012, DeWitt appeared in two separate stage productions of Love Letters starring opposite Tab Hunter and Tony Dow, respectively.

In 2012, DeWitt appeared on Suzanne Somers' talk show, Suzanne Somers: Breaking Through, during which she and Somers reminisced about their time on Three's Company together. Somers apologized for the conflict that arose between them, and they exchanged anecdotes about the last time they each spoke to their late co-star John Ritter. DeWitt's appearance on Somers' program marked the first time the two actresses had seen or spoken to each other since having a major falling out 31 years earlier, involving a salary dispute.

In 2018, DeWitt played Mother Superior in a stage production of Nunsense at the Hunterdon Hills Playhouse in New Jersey.