Lee Aaron was born on July 21, 1962 in Belleville, Ontario, Canada as Karen Lynn Greening. She is married to John. They have two children. She was previously married to Greg Thomas Doyle.
Karen began singing in school musicals at the age of five. She was discovered singing in a music production when she was fifteen years old, and was asked to join a local rock group called "Lee Aaron" while still in high school in Brampton, Ontario. Aaron's debut 1982 album The Lee Aaron Project featured a who's who of the Toronto music scene. 1984's recording of the album Metal Queen resulted in a multi-album deal with Attic Records. During the recording of this album, guitarist John Albani joined the band and he and Aaron formed a solid songwriting partnership that would last eleven years. In 1997, she began exploring jazz and blues. In 2002, Aaron was approached to audition with the Modern Baroque Opera Company. She was cast and appeared that year in an ALCAN Performing Arts Award-winning production called 101 Songs for the Marquis De Sade.
Lee Aaron continues to play both rock and selected jazz shows.