Mormon Sisters, Inc. was a group of Latter-day Saint women who incorporated to become a non-profit corporation to obtain bulk mailing rates for the publication of Exponent II. It grew out of meetings held by Latter-day Saint women in the greater Boston area starting about 1969 to 1970. These women were inspired by the "Woman's Exponent" which was published from 1872 to 1914. They decided to create a new publication for Latter-day Saint women along similar lines. Contributions were invited, covering a wide range of topics, news articles, short essays, poetry, suggestions, and letters to the editor. The publication started in July of 1974. Soon after, they changed their official incorporated name to Exponent II.

Exponent II was originally established under the name Mormon Sisters Inc, in 1974. It grew out of meetings held by Latter-day Saint women in the greater Boston area starting about 1969-1970. These women were inspired by the "Woman's Exponent" which was published from 1872 to 1914. They decided to create a new publication for Latter-day Saint women along similar lines. Contributions were invited covering a wide range of topics, news articles, short essays, poetry, suggestions, and letters to the editor. The publication started in July of 1974. Official founders included Claudia Bushman, Carrel Hilton Sheldon, Laurel Thatcher Ulrich, Judy Dushku, Sue Booth-Forbes and others. Soon after, the official incorporated name was changed to Exponent II. Exponent II also hosted various special events, including beginning in the 1980s, annual retreats. A related blog was established in 2005. In 2007, Exponent II began publishing online. The organization celebrated its 50th anniversary in 2024. Heather Sundahl and Katie Ludlow Rich co-authored a history of the organization titled "Fifty Years of Exponent II," published in 2024. Editors of Exponent include: Claudia Bushman (1974-1975); Nancy T. Dredge (1975-1981 and 2000-2009); Susan E. Howe (1981–1984) Susan Paxman (1984-1997); Jenny Atkinson (1997-2000); Aimee Evans Hickman and Emily Clyde Curtis (2010-2016); Margaret Olsen Hemming (2016-2021); Rachel Rueckert (2021-).

Sue Booth-Forbes was born to Clinton and Naomi Larson. The family were members of the Church of Jesus Christ of Latter-day Saints and Clinton worked at Brigham Young University. Sue also studied at BYU, receiving a degree in English and political science and began teaching school soon after. Sue married John Monroe Paxman, and they had two children. They later divorced.

Sue co-founded the Latter-day Saint women's journal, Exponent II, in 1974, and was its longest-serving editor, from 1984 to 1997, publishing under the name Susan L. Paxman or Sue Paxman. Sue was actively involved with Exponent II as a staff member, board member, and editor from 1979 until 1998, when she moved to West Cork, Ireland, to open Anam Cara Writer’s and Artist’s Retreat. She operated it for over twenty years, hosting and supporting more than 1,000 writers and other creative artists.