See biography by his son, Henry F. Brownson (3 vol., 1898-1900), who also edited his works (20 vol., 1882-87, repr. 1966), biographies by A. Schlesinger, Jr. (1939, repr. 1966) and T. Maynard (1943, repr. 1971); studies by L. Gilhooley (1980) and T. R. Ryan (1984).
For the next decade, Brownson was a part of the Transcendentalist movement which swept through the Boston Unitarian community. He read in English Romanticism and English and French reports on German Idealist philosophy, and was passionate about the work of Victor Cousin and Pierre Leroux. In 1836, the year of Emerson's Nature, Brownson participated in the founding of the Transcendental Club; he also published a pamphlet, New Views of Christianity, Society, and the Church, which combined Transcendental religious views with radical social egalitarianism, angrily criticizing the unequal social distribution of wealth as un-Christian and unprincipled. In 1838 he founded The Boston Quarterly Review, and served as its editor and main contributor for four years. Other contributors included George Bancroft, Margaret Fuller, George Ripley, and Elizabeth Peabody. Brownson originally offered use of the Boston Quarterly Review as the vehicle for the transcendentalists; they declined and instead created The Dial.
Brownson's writing contributions were political, intellectual, and religious essays. Among these was a review of Thomas Carlyle's Chartism, separately published as The Laboring Classes (1840), which caused considerable controversy. Also in 1840, Brownson published his semi-autobiographical work "Charles Elwood; Or, The Infidel Converted." Through the protagonist, Brownson railed against organized religion and the truthfulness of the Bible. In 1842, Brownson ceased separate publication of the The Boston Quarterly Review, and it was merged into The United States Magazine and Democratic Review, but his beliefs were once again evolving, and he found it necessary to break with the Review after a series of his essays created new scandal. He founded Brownson's Quarterly Review in 1844. This journal continued until 1864, and then was relaunched, late in Brownson's life and after a nearly ten-year hiatus, in 1873. It finally ceased publication in 1875.
In 1845 Brownson coined the term "americinization" at Fordham University, where he was an intellectual leader on campus.
In his 1848 "Letter to Protestants", Orestes Brownson coined the term Odinism. In 1857 he wrote a memoir, The Convert; or, Leaves from My Experience.
His remains were subsequently transferred to the crypt of the Basilica of the Sacred Heart at the University of Notre Dame, where his personal papers are also archived.
His daughter Sarah Brownson also wrote. She married the editor William Jewett Tenney.