Marcia has also appeared as a guest on such shows as Murder, She Wrote, A Different World, Magnum P.I., Taxi and had recurring roles on Full House, Charles In Charge and Alf.

Never offstage for long, she toured as Olive Madison in the female Odd Couple. Other stage credits include Same Time Next year, Twigs, It Had To Be You, Supporting Cast, Prisoner of Second Avenue, Plaza Suite, Gypsy, Promises Promises, Born Yesterday, Last of the Red Hot Lovers, You're a Good Man Charlie Brown, and most recently, as Ouiser in Steel Magnolias.

Marcia's first Los Angeles stage appearance was her starring role in An Almost Perfect Person, which she also produced. Prior to that, her New York stage credits include Calling in Crazy with Jill Clayburgh and The Fourth Wall, the improvisational comedy group which ran off-Broadway for a year. While in New York, she also started her TV commercial career and has appeared in over 50 to day.

Marcia successfully battled breast cancer in 1985 and she frequently lectures on the emotional and clinical tribulations of fighting breast cancer, promoting early detection and low-cost mammography. She also speaks on the importance of humor and laughter when facing life's challenges.

Marcia is currently giving voice to Ms. Edna Krabappel, Springfield's Elementary's beleaguered teacher on The Simpsons. She also just finished her first book. Both her speech and her book are entitled "Don't Look Back, We're Not Going That Way." The title is a quote from her larger than life father. Of course, he also used to say "If I don't see you again the mule is yours," so not everything he said was deep. The book is subtitled "How I Overcame a Rocky Childhood, a Nervous Breakdown, Breast Cancer, Widowhood, Fat, Fire & Menopausal Motherhood and Still Managed to Count My Lucky Chickens."