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Gold was born to Joe and Bonnie Fisher in Great Falls, Montana, one year after her elder sister, Tracey. In 1973, after her mother's remarriage to Harry Goldstein, both Missy and Tracey were legally adopted by their stepfather and became known as Tracey and Melissa Goldstein. Missy and Tracey as well as two other siblings born to their mother and new father, Brandy and Jessie, subsequently shortened their family name to Gold for professional use.
Her acting siblings include older sister Tracey (best known as Carol on Growing Pains), younger sister Brandy Gold (best known as Alexis on St. Elsewhere) and Jessie Gold, who has had a variety of guest spots. The youngest sister Cassie is the only non-acting member of the siblings.
She appeared on Eight Is Enough, Fantasy Island, Nancy Drew and Trapper John, M.D. and earned a degree of fame playing Katie Gatling on Benson, where she won an award for best young actress in a comedy series in 1984 before leaving the business.
Gold enrolled at Georgetown University, as a pre-med student, and then earned her Ph.D. from California School of Professional Psychology. Now known as Dr. Melissa Wiedmann, she resides in Saint Helena, California where she is a licensed psychologist. 
- Staff (June 26, 2000). "Benson: 1979–1986". People. Retrieved April 30, 2017.
- "A Terrible Hunger - Eating Disorders and Struggles, Scary Skinny, Tracey Gold". Retrieved April 29, 2017.
- California Board of Psychology
- Maine Department of Professional and Financial Regulation | Office of Professional and Occupational Regulation | Board of Examiners of Psychologists