Jane Kaczmarek (born Wednesday, December 21, 1955 in Milwaukee, Wisconsin) is a United States actress.

She is best known for her role as Lois, the mother in the popular sitcom Malcolm in the Middle.

Kaczmarek majored in theater at the University of Wisconsin where she met future actor Tony Shalhoub. She later enrolled in Yale with Shalhoub and was a part of its theater company. She has had several Broadway hits, including Lost In Yonkers and has occasionally guest starred on The Simpsons, providing the voice of Judge Constance Harm.

She is married to West Wing actor Bradley Whitford

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