Branch spent most of her school years in New York and Brooklyn where she studied at Smith College, as well as Froebel and Adelphi Academies, which were near her father's law practice. After graduating from
Smith College in 1897, she studied
dramaturgy at the
American Academy of Dramatic Arts, earning her degree in 1900. A year after graduating from Smith, her poem "The Road 'Twixt Heaven and Hell" was selected as the year's best verse by a college graduate by
Century Magazine. "The Wedding Feast," a poem from the first collection, reworks
Coleridge's "
The Rime of the Ancient Mariner." The second collection features odd settings and characters. And her most famous single poem "
Nimrod"—a
blank verse epic staged at the
Empire Theatre in 1908—is about a Biblical king who inspired several pre-Raphaelite works.
Sonnets from a Lock Box (1929) is regarded as her best work. It is a collection of thirty-eight sonnets using the
first person, noted for its directness and mystical symbolism. Her final collection of poetry,
Last Poems (1944), was published posthumously by
Ridgely Torrence. Branch was also the author of
A Christmas Miracle and God Bless this House (1925) and ''Bubble Blower's House'' (1926). Branch was also known for her philanthropy, mostly centered around
Christodora House, a
settlement house in
New York City. There she created the Poet's Guild, whose members, including
Edwin Arlington Robinson,
William Rose Benét,
Percy MacKaye, and
Margaret Widdemer, taught classes at the house. Branch was also vice president of the
Poetry Society of America. ==Later life==