Lella Faye Secor was born in Battle Creek, Michigan, in 1887, the youngest of her mother's seven children. When an older brother settled in the West, Secor homesteaded on property adjoining his, near Coulee, Washington. She soon moved to Seattle. Earlier, she had met Rebecca Shelley at the University of Michigan, and the two young women had become close friends. When Shelley asked Secor to be a reporter on the Henry Ford Peace Expediton, Secor accepted and was on board when the ship, the Oscar II, sailed in December 1915. While not a pacifist when she left on the voyage, Secor quickly became "heartily in sympathy with the plan for continuous mediation" and a "thorough pacifist".
Her companions on this trip, besides Mr. Ford, included such dedicated pacifists as Shelley, Rosika Schwimmer, and Louis Lochner. After her return from the Ford trip in January l9l6, she remained in New York City and became very active in pacifist efforts to keep the United States out of World War I. She already considered herself and Shelley "radicals" who found it necessary "to fight the old pacifists every step of the way".
She was on the executive committee of the American Neutral Conference Committee whose specific object was "to urge our government to call or co-operate in a Conference of Neutral Nations which shall offer joint mediation to the belligerents by proposals calculated to form the basis of a permanent peace." This organization faltered and was reborn in early 1917 as the Emergency Peace Federation, of which Secor was the secretary. That summer, Secor and Shelley launched the People's Council of America with which the Emergency Peace Federation merged. This group tried to hold a conference in Chicago, but because of pro-war sentiment, was unable to do so and no effective work was carried out after that by The People's Council. As Emily Greene Balch wrote, "The movement had different names at different times - American Neutral Conference Committee, First American Conference for Democracy and Terms of Peace; People's Council of America; Emergency Peace Federation; National Council of Labor; ..." The names were often the same - Balch, Rebecca Shelley, Lella Secor, Fanny G. Villard, Oswald Villard, and Louis Lochner among them.
Secor was on the executive committee of The Young Democracy in l9l8 and also on the Mass Meeting Committee of Friends of New Russia, both short lived ventures.
In 1917, she married Philip Sargant Florence, a teacher who respected Secor's right to pursue a career. The couple had two sons and moved to Cambridge, England, in 1921. Here, Secor joined the Women's International League and spoke on women's rights, using her maiden name of Lella Secor. She founded the Cambridge Birth Control Clinic in 1925. In 1930, she wrote a book, Birth Control on Trial. The family finally settled permanently in Birmingham, England, where she continued to write and to be active in politics and birth control causes. Lella Secor Florence died in 1966.