Adelaide Florence True was born in Bradford, Maine, and married Edward Ellery. She graduated from Colby in 1890, and remained, working toward her master’s degree, for three years before eventually transferring and completing her education at Radcliffe College in 1902. She was a member of the Sigma Kappa sorority started by Mary Low Carver. Adelaide Ellery worked seasonally as a principal of a high school in Barre, Massachusetts from 1890-1894, and traveled Europe from 1894-1895. She became the principal of Acadia Seminary in Wolfville, Nova Scotia from 1895-1899, and then vice-principal at Vermont Academy in Saxton’s River from 1903-1909. She retired to Schenectady, New York and became a class agent.