While attending Barnard, Fleischman enjoyed painting and singing and earned varsity letters in a multitude of activities, including softball, basketball, and tennis.

[6] She left this job in 1914 to write for the women's page at the New York Tribune, where she would eventually be promoted to assistant Sunday editor.

[4] She traveled to San Francisco to cover the International Conference of Women Workers to Promote Permanent Peace, and she was the first woman, as far as she knew, to report on a professional boxing match.

[4][6] As a reporter, she often covered women's efforts to live independently, organize politically, and pursue careers that were typically reserved for men.

[9] In 1919, Bernays expanded his firm, renting an office space and hiring Fleischman as a full-time staff writer and "balance wheel".

[9][6] Bernays, Fleischman, and their growing staff promoted products like cottonseed salad oil and radium; films and plays like The Heart of the Jungle and The Famous Mrs. Fair; events hosted by the ACLU, the New York Society for Ethical Culture, and the Women's Non-Partisan Committee for the League of Nations; and a fundraising campaign organized by the New York Federation of Jewish Philanthropies.

[8][9] They also worked on two political campaigns: an effort to remove the American valuation clause from the Fordney–McCumber Tariff Bill, and a brief 1920 attempt by Al Smith to lay groundwork for a presidential run.

She also proved herself by going on to work with important clients like Dwight D. Eisenhower, Sigmund Freud, Jane Addams, Irene Castle, Theodore Roosevelt, and Thomas A.

[14] Around this time, Fleischman took her passion for feminism and wrote about women's issues for national publications and had numerous published articles in magazines like Ladies' Home Journal and American Mercury.

[8] Starting with her essay "Notes of a Retiring Feminist," published in the American Mercury in 1949, she began to use her married name Doris Fleischman Bernays professionally.

[14] In 1950, Fleischman was contacted by Ruth Hale, founder of the Lucy Stone League, to help revive her organization which had been inactive for almost two decades following its founding in 1921.

Upon the revival of the League, Fleischman served as its vice president and worked with other women who were pioneers in their fields such as Jane Grant, Doris Stevens, Anna M. Kross, and Fannie Hurst.

[8] Around this time, Fleischman also began searching for publishers to print a book she had been working on for over three years which detailed the struggles women face in the domestic and professional settings.

However, these retirement plans did not last, and Fleischman and Bernays continued to work after they sold their New York office to establish a new public relations business in Cambridge.

[8] These competitions consisted of submissions by organizations and individuals and sought out the best plans for solutions in pay equity and justice for women in the workplace and the home.