Park Overall was born in Tennessee to a respectable family. Her parents were a college English professor and a judge. Park, however, did her best to be unrespectable. She was a rebel-- smoking, drinking, and hanging out with older boys.
Park attended Tusculum College in Greeneville, Tennessee. It was there that Park discovered her love of acting. She appeared in several local plays before graduating in 1981.
Park's father financed her move to New York to become a professional actress. She began working steadily and by 1986 was appearing in small Broadway parts.
In 1988, she was cast in her breakthrough role as Laverne on Empty Nest. Unfortunately, Park was unhappy in the role. She felt Laverne was a hillbilly, but Park was bound by her contract. For her role as Laverne, Park was nominated for 3 Golden Globes (Best Performance by an Actress in a Supporting Role in a Series, Mini-Series or Motion Picture Made for TV) in 1991, 1992, and 1993. She won 3 Q awards from Viewers for Quality Television in 1989, 1990, and 1991.
She began appearing in made for TV movies. She also became an active voice for several political causes.