She was raised in accordance with the principles espoused by her behavioral psychologist grandfather, John B. Watson, who believed that children should never be held or cuddled. She says that the lack of warmth at home is what drove her to the theatre.
Her first movie was 1962’s Ride The High Country. She starred as Elsa Knudsen.
Mariette's father committed suicide in 1962. Her family kept it a secret for 25 years, but she eventually revealed the incident. This brought her considerable acclaim for speaking out on the subject, and she co-founded the American Foundation for Suicide Prevention. Her father, uncle, and cousin all committed suicide.
In 1965, Mariette starred as Claire Morton on Peyton place.
From 1966-67, she starred as Ruth Garrett in The Hero, shown here with co-star Richard Mulligan. This short-lived series also starred Victor French.
]In 1965, she played Barbara Scott in Bonanza's Right Is the Fourth R
And in 1968, she played Mamyope, a.k.a. Alicia Purcell, on Bonanza's The Survivors.
In 1969, she guest starred as Zarabeth in Star Trek’s All Our Yesterdays. Although Gene Roddenberry fought with the sensors, he was unable to show Mariette’s navel in this episode. For those who have not seen this episode, Zarabeth falls in love with Spock - and he with her.
1970's Is There Any Man Here? is a Bonanza episode that puts Mariette's character, Jennifer, in Ben's arms!
She turns out to be quite a fickle woman - one out for her own version of happiness - and we should have known it from the way she entered the house and immediately compared herself to Ben's wives!
In 1971, she guest starred in her final Bonanza appearance - The Iron Butterfly as Miss Lola Fairmont
This time, it's Hoss who is left with a broken heart.
The year is 1973, and Gene Roddenberry makes another unsuccessful attempt at a new Sci-Fi series, Genesis II, starring Mariette – with two navels – as Lyra-a.
Mariette won an Emmy Award for her role in the memorable 1978 TV movie "The Incredible Hulk: Married (#2.1)" (1978) which co-starred the late Bill Bixby.
In 1983-84, Mariette co-starred as Jennifer Barnes with Bill Bixby in the short-lived sitcom, Goodnight, Beantown.
During the late 1970s and into the early 1980s, Hartley appeared with James Garner in a popular series of television commercials advertising Polaroid cameras
On January 12, 1987, The Morning Program made its debut hosted by actress Mariette Hartley and Rolland Smith.
From 2003-2011, Mariette played attorney Lorna Scarry on Law and Order: Special Victims Unit.
In 2006, she performed her one-woman show "If You Get to Bethlehem, You've Gone Too Far," which is based on her 1990 best-selling biography "Breaking the Silence." Mariette enacts eleven characters from her memories as a child living in a home beset by acute depression and alcoholism.
Mariette has been married at least twice. The information I found is uncertain about a third and current marriage.
She was married to John Seventa from 1960-1962, then to Patrick Boyriver from 1978-1996. Mariette and Patrick have two children, Justine and Sean.