1. Her first paying job was dancing at Radio City Music Hall in 1956.

After devoting her childhood to training as a dancer, Harper landed her first paying job as a replacement dancer in the Corps de Ballet at Radio City Music Hall, where the Rockettes were the headlining act. She was only 16 at the time.

2. She beat out hundreds to become a dancer in 'Li'l Abner' on Broadway in 1958.

In her biography, I, Rhoda, Harper describes the tryouts for the Broadway show Li'l Abner as a "cattle call," but she managed to beat out the others and land her role as a dancer through sheer athleticism. Her varied training as a dancer went beyond ballet, including jazz and even roller-dancing. She says it better prepared her for Li'l Abner's challenging physicality. Other Broadway casts she joined included Wildcat (with Lucille Ball!) and Take Me Along.

3. She toured with Second City soon after studying acting.

When Harper was ready to move from dancing into acting, it didn't take long for her to be led to join Second City's cast. In the mid-'60s, she joined Paul Sills' Story Tellers and toured the country, quickly gaining attention as a standout performer and actress.

4. Harper voiced characters for a Jewish comedy album.

In 1966, Harper voiced various characters for the comedy LP When You're in Love the Whole World Is Jewish. It was a sequel to You Don't Have to be Jewish, a popular release from the previous year. Harper was brought onboard after the actress from the first album, Arlene Golonka (who notably played Millie Hutchins on The Andy Griffith Show), could not return. Harper and Golonka were pals and the latter recommended Harper as her replacement.

5. She co-wrote an episode of 'Love, American Style'.

The sole screenwriting credit to Harper's name was a 1970 episode of Love, American Style that she co-wrote with her then-husband, Dick Schaal. That episode, "Love and the Visitor," had a pretty amusing premise: An anthropologist and an archaeologist find themselves in a love triangle with a gorilla. 

6. Mary Tyler Moore gave Harper some of her best jokes

In an interview with the Archive of American Television, Harper discussed working with actress Mary Tyler Moore on The Mary Tyler Moore Show. According to Harper, Moore would occasionally read her lines and hear them more as "Rhoda lines," giving away some of her best jokes and paving the way for Rhoda to grow as a character as beloved as Mary Richards. Of course, Rhoda went on to become a popular spin-off, and Harper won four Emmy Awards and one Golden Globe for her work as Rhoda.

7. Despite her fame as Rhoda, Harper was nominated as "New Female Star of the Year" in 1974.

Harper joined the cast of Freebie and the Bean, playing the Alan Arkin's on-screen wife Consuelo. The cast was star-studded, with Arkin and Harper alongside James Caan and Loretta Swit, but it was Harper who stood out, nominated for a Golden Globe as "New Female Star of the Year" in 1974, despite how familiar her face had already become to fans of The Mary Tyler Moore Show.

8. Harper parodied Marilyn Monroe on 'The Muppet Show' in 1976

Harper was one of the first guest stars featured in the original season of The Muppet Show in 1976, playing a character who dreams of being good enough for Broadway. Through a series of costume changes, Harper convinces Kermit she's got the stuff to make it, including a funny turn as a Marilyn Monroe type. 

Watch it here

9. She was awarded $1.4 million in her settlement with NBC over 'Valerie'.

In the mid-'80s, Harper returned to TV to star in Valerie on NBC, but the network fired her after two seasons, over an issue with her salary. (As you'll learn below, Harper was very involved in fights for equal pay at that time.) She sued NBC for breach of contract. During the court proceedings, the judge found that her claim was unfounded and dismissed it — but not before also noting that NBC had wrongfully fired Harper. For that, she was awarded $1.4 million. NBC kept the series going, killing off her character, but not cutting off the actress who inspired it, as her wrongful firing also meant NBC had to share 12.5% of Valerie's profits with her.

10. Harper fought for equal pay in the 1980s

Soon Harper evolved from acting into an activist. As an advocate for the Equal Rights Amendment in 1980, she was an active, vocal chairwoman of a Committee to Ratify ERA, which included stars like Barbra Streisand, Henry Winkler, Ed Asner, John Ritter and more. She fought for equal pay for women and publicly attacked labor laws that restricted a woman's rights to earn. Later, her activism would grow to also include a 1983 charity dedicated to helping needy kids in Los Angeles. L.I.F.E. (Love Is Feeding Everyone) would partner with major corporations to donate funding that fed millions annually, as reported by The Los Angeles Times in 1990.

Image: AP Photo

11. She married her fitness instructor.

John Ritter dubbed him "The Lone Re-Arranger." Personal trainer Tony Cacciotti had whipped the Three's Company star into shape. The Hollywood fitness guru had also toned up John Travolta for Saturday Night Fever and Richard Gere for American Gigalo. Harper paired with Cacciotti as she prepared for a swimsuit scene in 1979's Chapter Two. Her three-hour-per-day, six-day-a-week regimen with Cacciotti led to romance, as reported by People in a rather dated cover story. The two married in 1987 and stayed together.

Image: AP Photo / Nick Ut