Peabody was a teacher, writer, and prominent figure in the Transcendental movement, editing The Dial, the chief literary publication of the movement, for two years. During 1834-1835, she worked as assistant teacher to Bronson Alcott at his famous experimental Temple School in Boston.
After the school closed, Peabody published Record of a School, outlining the plan of the school and Alcott's philosophy of early childhood education, which had drawn on German models. When she opened her kindergarten in 1860, the concept of providing formal schooling for children younger than six was largely confined to German practice.
Through her own kindergarten, and as editor of the Kindergarten Messenger (1873-77), Peabody helped establish kindergarten as an accepted institution in U.S. education. She also wrote numerous books in support of the cause.
The extent of her influence is apparent in a statement submitted to Congress on February 12, 1897, in support of free kindergartens: