Devens was born on 17 May 1857 in Ware, Massachusetts, the daughter of Arthur Lithgow Devens and Agnes Howard White Devens. She grew up in Cambridge, Massachusetts and developed an interest in photography sometime in early life. She had a strong interest in printing techniques that could be manipulated by the photographer, including ozotype, gum bichromate and platinum printing. She mastered the gum bichomate process so well that she gave a lecture on it to the Cambridge Photographic Club in 1896. At some point before her mid-30s, Devens met Boston photographer F. Holland Day, who influenced her career through encouragement and advocacy of her work. He personally submitted five of her prints to the London Photographic Salon of 1898 and was responsible for introducing her to photographer Alfred Stieglitz, with whom she would regularly correspond for many years. Day also promoted her work in his famous lecture "Photography as Fine Art" at the Harvard Camera Club in 1900 and included several of her prints in his 1901 exhibition “The New School of American Photography.” Devens traveled to Europe in 1900-1901, and there she met Edward Steichen and Robert Demachy. Demachy was so impressed with her work that he added several of her photographs to the important Paris exhibition of women photographers organized by Frances Benjamin Johnston. In 1902 Devens was elected to Britain’s Linked Ring, and Stieglitz listed her as a founding member of the Photo-Secession. That same year Stieglitz also listed her as one of the ten most prominent American pictorial photographers in an article in Century Magazine. He also published one of her photographs in his famous journal Camera Work. About this same time Devens’ eyesight began to fail rapidly due to an unknown cause. After 1904 she showed only a few prints in exhibitions, although Stieglitz included her work in the inaugural exhibition at his Little Galleries of the Photo-Secession in 1905. She is not known to have engaged in any photographic activity after 1905. Devens died on 13 March 1920 in Cambridge. A memorial exhibition of her work was held soon after her passing in 1920 by the Society of Arts and Crafts.
