Caroline Healey was born and raised in Boston, Massachusetts, daughter of Mark Healey, a merchant and investor, and Caroline Foster. She lived there off and on during her life. As a young woman, she received a comprehensive education, encouraged by her father to write novels and essays, and to engage in debates about religion, philosophy and politics. In addition to private tutoring, she attended a private school for girls run by educator Joseph Hale Abbot, until the age of fifteen. In the fall of 1842, Healey taught at Lydia S. English's Female Seminary. Over Christmas 1842, a Unitarian minister from Baltimore named Charles Dall came to fill an open pulpit in Georgetown. Healy initially found Dall unappealing and she was shocked when he proposed to her by letter months later. But after a few weeks of correspondence, she accepted his proposal, reigned her teaching position, and moved to Baltimore. She married Charles Dall, a Unitarian minister who worked with the poor in Baltimore, in 1844. The two lived in Toronto during the early 1850s, and returned to Boston in 1855. Her children included William Healey Dall, in whose Washington DC home she lived her later years.
Work for women's rights
Though she continued to write through the early years of her marriage and child-rearing, after her husband moved to Calcutta, India to perform missionary work, Dall became an active participant in the Boston Women's Rights movement. She was soon an active lecturer and writer on the topic, and organized the New EnglandWomen's Rights Convention, along with suffragist Paulina Davis. Also with Davis she founded Una, a journal devoted to woman's rights, and the pioneer publication of its kind. After deciding that she did not like working with groups, Dall turned to writing as her principal means of addressing women's equality. her most prominent works from this time included Historical Pictures Retouched: a Volume of Miscellanies, which highlighted previously ignored women in history, and a collection of lectures entitled The College, the Market, and the Court; or Woman's Relation to Education, Labor, and Law in which she argued that the modern woman was no longer content to be in the domestic sphere and should be allowed to participate in public life. The New York Evening Post called this collection "the most eloquent and forcible statement of the Woman's Question which has been made." Dall was a founder of the Social Science Association.
Later life
In the late 1860s, Dall retired from the Women's Rights movement and turned her writing attention to such diverse topics as Egypt and the Civil War. During this time, she also moved to Washington, D.C., where she became a friend of the current first lady Frances Cleveland. Much of her later work was about the American Renaissance to which she was witness as a young woman. Works from this period include Margaret and Her Friends: Ten Conversations with Margaret Fuller and Transcendentalism in New England: a Lecture, given to the Society of Philosophical Inquiry at the age of 73. During this time, she also gave the occasional sermon in the Unitarian Church, one of the earliest women to do so. In the last years of her life, she suffered greatly from arthritis, though she remained active until her death at the age of 90 on December 17, 1912.