She played Georgie Anne Lahti Hartman on the comedy series Hearts Afire, co-starring John Ritter. After The Fall Guy, she played Christine Sullivan on the 1980s television comedy series Night Court from the third season until the show's end. She appeared in the science-fiction series Buck Rogers in the 25th Century and as Diane Chambers' best friend in the sitcom Cheers, before eventually becoming a regular on the ABC action drama The Fall Guy. Post's early acting credits included a 1979 episode of Barnaby Jones and the pilot episode of Simon & Simon 'Details at Eleven' in 1981, episode one of season two of The Greatest American Hero, two episodes of The A-Team as two different characters in the 1983 episode 'The Only Church in Town' and the 1984 episode 'Hot Styles', and The Love Boat. She helped a contestant win the $100,000 grand prize in a November 1987 tournament episode of The $100,000 Pyramid. Later, after achieving fame as an actress, she played various game shows as a celebrity guest, including The Match Game-Hollywood Squares Hour, Super Password, The (New) $25,000 Pyramid, and The $100,000 Pyramid. She also served as associate producer of CBS's Double Dare and as a card dealer on NBC's Card Sharks.

She began her career with the production crew of the Tom Kennedy version of Split Second. Prior to acting, Post worked on several game shows.

Post then attended Lewis & Clark College in Portland, Oregon, and briefly attended Pomona College in California before returning to Lewis & Clark to earn her Bachelor of Arts degree. She attended Las Lomas High School where she was a cheerleader. The second of the couple's three children, she and her two siblings were raised in Stanford and Walnut Creek. Post, worked as a physicist her mother, Marylee (Armstrong) Post, was a poet. Post was born in Palo Alto, California, on November 4, 1950. Her best known roles include: bail bondswoman Terri Michaels in The Fall Guy on ABC from 1982 to 1985 public defender Christine Sullivan on the NBC sitcom Night Court from 1985 to 1992 Georgie Anne Lahti Hartman on the CBS sitcom Hearts Afire from 1992 to 1995 and Barbara ‘Bunny’ Fletcher, the mother of Detective Erin Lindsay ( Sophia Bush), on the NBC drama series Chicago P.D. Marjorie Armstrong Post (Novem– August 7, 2021), known professionally as Markie Post, was an American actress.

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