- Katherine won the role of Jessica in Soap after one of the directors of Soap saw her in a play. Though 250 actresses had tested for the role of Jessica in Soap, she got the role and became famous.
- Katherine performed in The Vagina Monologues in June, 2001.
- Katherine stands 5’2” tall but wears heels in most of her roles.
- Katherine was nominated for Broadway's 1973 Tony Award as Best Supporting or Featured Actress for the show The Great God Brown.
- Katherine was born Of Irish Catholic extraction on the side of her late mother, Thelma Malone.
- Katherine was born Katherine Marie Helmond
- Katherine married David Christian in 1962 and are still married today.
- Katherine was married to George Martin in 1957 and they divorced shortly after marrying.
- Katherine directed the TV series Benson.
- Katherine directed the episode Tony the Nanny of the TV series Who's the Boss?.
- Jessica Tate was the character Katherine portrayed in the TV series Soap.
- In the TV series Who’s the Boss Katherine played Mona Robinson.
- In the TV series The Alvira Show Katherine was Aunt Minerva.
- Ma Cavello is whom Katherine portrayed in the movie Steven Spielberg’s Directors Chair in 1996.
- Katherine appeared in the TV series Coach as Doris Sherman from 1995 through 1997.
- Mrs. McBride is whom Katherine played in the 2000 release of The Perfect Nanny.
- Katherine was The desk clerk in the movie Fear and Loathing in Las Vegas.
- In the movie The Stand Katherine was the character of Isabelle which was released in 2004.
- Playing Crazy Cora Wilkens in Beethoven’s 5th Katherine gained even more fame.
- Katherine will be starring in the film Cars which will be released in 2006.
- The episode of Who's The Boss intitled Mona was the original concept for a series for Katherine but the show was never picked up off the ground.
- Katherine :Tony Nominations: The Great God Brown (1973).
- Katherine: Emmy Nominations: Soap (1978, 1979, 1981); Who's The Boss (1988, 1989).
- Katherine: Golden Globe Nominations: Who's The Boss (1986).
