In 1993, following Mary-Kate and Ashley's success on Full House, a limited liability company, Dualstar Entertainment Group was created to produce Mary-Kate and Ashley-branded products.It produced a successful long string of TV movies and direct-to-video releases featuring the girls.Ashley, meanwhile, is currently dating a 30-year-old artist, Louis Eisner.The two have been photographed together a couple times.In 2006, in an attempt to gain credibility in the fashion industry after their association with Wal-Mart tarnished their reputations, they were tapped as the faces of the upscale fashion line Badgley Mischka. Responding to a claim by an anonymous law enforcement official that she would not speak to federal investigators without a promise of legal immunity, Olsen's attorney Michael C. She starred alongside her twin sister in the films, To Grandmother's House We Go (1992), Double, Double, Toil and Trouble (1993), How the West Was Fun (1994), It Takes Two (1995), Billboard Dad (1998) and in the television series, Two of a Kind (1998-1999).
She began her acting career at the age of nine months old when she and her twin sister, Ashley Olsen, were hired to share the role of Michelle Tanner on the popular television sitcom Full House (1987-1995).
They starred in Passport to Paris (1999), Our Lips Are Sealed (2000), Winning London (2001), Holiday in the Sun (2001) and in the television series, So Little Time (2001–2002).
They became household names and popular figures in the preteen market during the late 1990s and early 2000s, with Mary-Kate's likeness seen in clothes, books, fragrances, magazines, movies, and posters, among others.
Her one short scene was ultimately cut from theatrical release, but was included on the film's DVD.
In 2007, she had a recurring role on television show, Weeds, and the twins said that if they became involved in movies together again, it would be as producers.
In 2004, Olsen's wealth was estimated at $137 million.