On 1st of February 1966, Joan got married to love of her life John Marshall. John Marshall is the former reporter at the KNBC-TV. From this married life she welcomed a daughter named Vanessa Marshall. They are still strongly bonded into this married life as a loving husband and wife. She is now aged 72 years old. Her height is five feet and seven inches tall and her nationality is American.
Joan was raised in Boulder, Colorado. When she was in her mid teens, she took an interview with actress Julie Harris as a student reporter. At the end of the interview Julie pursued her to apply to the Yale School of Drama. She joined their graduate program for about a year and then she began appearing in school plays. She has been pursuing her acting career since the early 1960s. One of her early acting role was in the play The Miser. In 1967, she appeared in an American television drama series Run for Your Life playing the role of Donna Hayward. The following year she starred the role of Paula in an American prime-time soap opera Peyton Place. In 1971, she appeared in the play The School for Wives and this role earned her massive fame and popularity. She is also well acclaimed for starring the role of Valene Ewing in the TV series Knots Landing. Till date she has appeared in more than five dozens of movies and TV shows. Her net worth is in millions.