Moira Harris was born on July 20, 1954 in Pontiac, Illinois.
She graduated from Illinois State University in Normal, Illinois, where she was a classmate of actor John Malkovich
. She joined the Steppenwolf Theatre Company, and fell in love with and married one of its founders, actor Gary Sinise
. She has appeared in several films, including, Of Mice and Men
(1997), and Terminator 3: Rise of the Machines
(2003). She has also done television work, most notably Murder in Green Meadows
, for which she won an Emmy award.
She and Gary Sinise mairred in 1981, and are still happily married to this day. They have 3 children together: Sophie, McCanna, and Ella.