Bachelor in Political Science, Barnard College, 1993.
She was the editor-in-chief of Seventeen magazine and the founding editor of CosmoGIRL!. They later relocated to Malverne, on Long Island. As an undergraduate student at Barnard College, Rubenstein became a public relations intern at Lang Communications, the company that bought Sassy magazine.
She worked at Carvel and retail stores to pay her bills. Rubenstein dropped out of Alpha Chi Omega sorority and took night classes to take part in her second magazine internship, which led to a position in the editorial department of American Health magazine. Columbia University honored Rubenstein in 2004 by naming her one of the top 250 alumni through the ages.
In 1993, Rubenstein became a fashion assistant at Cosmopolitan and five years later was made the senior fashion editor. This led to Hearst Magazines president Cathleen Black asking Rubenstein to come up with a concept for a new magazine. Forty-eight hours later Rubenstein presented the idea of CosmoGIRL! and was offered the position of editor-in-chief.
This made her the youngest editor-in-chief in Hearst Magazine's 100-year history. Rubenstein went on to make CosmoGIRL! a success with a circulation of 1.25 million readers. In May 2003, Hearst Magazines bought Seventeen magazine and gave Rubenstein the position of editor-in-chief.
Rubenstein quickly went on to reverse a five-year decline in Seventeen’s newsstand sales and delivered total newsstand growth of 23% by the end of 2005. In the fall of 2005, a series that Rubenstein conceived titled Miss Seventeen, debuted on MTV. The series featured seventeen girls competing for the honor of being Miss Seventeen – a life-changing award that included a college scholarship, an internship at Seventeen, and a cover and spread for the iconic publication. Rubenstein was the Creator and an Executive Producer on the series.
She has also appeared in numerous episodes of the reality show series, America's Next Top Model Season 2. (4 episodes, 2006) On 7 November 2006, she announced that she would be leaving the magazine to launch her own teen-centered Web business, write a book and start a consulting firm specializing in the youth market. Her replacement is Ann Shoket.
In December 2006, Rubenstein started Big Momma Productions, Inc. after a thirteen-year career with Hearst Magazines.
She is a member of the Candie’s Foundation Board of Directors, which helps educate young people about the consequences of teen pregnancy.
Married Ari Rubenstein, 1998.