Schwartz was the brains behind beloved TV hits The Brady Bunch and Gilligan's Island.
He also had links to other classic series My Favorite Martian, Harper Valley PTA and The Red Skelton Show.
He died of natural causes, according to TMZ.com.
Following the death of her husband, Stella Johnson, a beautiful and outspoken mother, moves to Harper Valley, Ohio, a hotbed of hypocrisy. Because of her flamboyant style and independent attitude, she encounters the objections of the PTA, a group of prudes who believe she is a bad influence and seek ways to discredit her in hopes that she will leave town.
Episodes relate Stella's efforts to remain in Harper Valley by "teaching her neighbors some lessons" and showing them up as the hypocrites they are.