Previously, the role was portrayed by Ashley Bashioum from 1999 to 2002 and 2004 to 2005, Nicole Tarantini temporarily in 2001, Rachel Kimsey from 2005 to 2006 and Clementine Ford from 2009 to 2010.

[5] Much of her history revolves around her role in the teen scene of the series, her romance with Billy Abbott,[6] and marriage to J.T.

[9] The following year, it was announced that Bashioum would be leaving the role after she was unable to reach an agreement with the producers over the negotiation of her contract.

[17][18] However, after an additional year as the character, Bashioum was let go and another immediate recast was named, Rachel Kimsey.

[19] Former co-executive producer John F. Smith issued a statement explaining Bashioum's exit, saying they decided to "move the story in a different direction" and "Ashley's school schedule made it difficult".

[22][23][24] "I had come of THE L WORD, which was very creatively open, and to go from something that is so loose and free to a soap opera felt like I walked into a job on Wall Street or some- thing.

And then at one point, they had me in this V-neck, and [former Executive Producer Paul Rauch] called over the loudspeaker that you could see right up my shirt and that it was inappropriate so they sent me back to wardrobe.

In March 2009, it was announced that former The L Word star Clementine Ford had been cast as the fourth actress to portray the character.

[26][27][28] She stated that she knew co-star Greg Rikaart, who portrays Kevin Fisher, and had a "sneaking suspicion" that he had "something to do" with her being cast in the role.

[32][33] During her time on the soap, Ford was diagnosed with Multiple sclerosis, but initially did not reveal her symptoms as she feared being fired.

[39] Mac runs away from home in St. Louis and befriends Katherine Chancellor (Jeanne Cooper) in a homeless shelter.

Mac, Kay and their friend Birdie move into the Chancellor Estate together much to the dismay of co-owner, Jill Abbott (Jess Walton).

A devastated Mac disappears and wanders into the local coffee house, Crimson Lights, and is taken in by Nina Webster (Tricia Cast).

As Jill threatens to find Amanda to send Mackenzie back home, the two start seeing each other in secret and Billy gives Mac an opal ring as a symbol of their love.

When Billy, Brittany and Raul are chosen to represent Glo by Jabot Kids, Mac helps Phyllis Summers (Michelle Stafford) with running the website.

Billy and Brittany reconcile while Raul broke up with Mac for Rianna Miner (Alexis Thorpe).

Mac and Billy are drawn together, and with help from his older half-brother, Jack (Peter Bergman), they soon begin dating with Jill's blessing.

Mac's stepfather, Ralph, begins stalking her, coercing Amanda into helping him steal from the Chancellor Estate.

Thinking he has killed Ralph, Billy takes Mac to hide out in their special place, the old Abbott playhouse.

Mac returns after spending time in the Southwestern U.S. helping out teaching kindergarten and preschool children on an Indian reservation.

She miscarries and J.T., who is livid that Mac did not tell him but confided in Kevin instead, has a one-night stand with Victoria Newman (Amelia Heinle).

Mac goes to New Orleans to work with her father and signs a power of attorney turning the coffee house over to Kevin.

When Katherine is presumed dead, Mac is unable to attend her funeral as she is ill and living in Darfur, Sudan.

After it is revealed that Katherine is alive, Mac shows up at the Chancellor mansion just in time for Billy's marriage to Chloe Mitchell (Elizabeth Hendrickson).

Mac decides to stay in Genoa City to support Katherine, which makes Chloe concerned for her marriage.

After Billy reluctantly gives them his blessing, Raul asks Mac to marry him and return to Washington DC with him, which she accepts.

On the night they attempt to make love after years apart, they are interrupted by a phone call that Katherine has had another mini-stroke and is in hospital.

Cane Ashby (Daniel Goddard) sells Jimmy's Bar to Mackenzie when he decides to leave town.

They get married with Katherine's help and the couple move to Washington, D.C., after Mac receives a job offer there, taking Reed with them.

Years later, JT returns to Genoa City and it is revealed that he and Mac are getting divorced and she is suing for full custody of their children.