British peace activist, author, atheist and freethinker, and the daughter of political activist and atheist Charles Bradlaugh. Bonner is most remembered for being the author of her father’s biography, Charles Bradlaugh: His Life and Work.
She was named after Hypatia, the Ancient Greek pagan philosopher, mathematician, astronomer and teacher, who was murdered by a mob of Coptic monks under the authority of Christian archbishop Cyril of Alexandria.
Bonner was educated in private schools in London and Paris, and qualified as a science teacher from the University of London, which admitted women to “full privileges” (i.e. degrees) in 1878. She taught in the Hall of Science for the South Kensington Science and Art Examinations, and also acted as a secretary for her father after 1888.
From 1897 to 1904, she was editor of The Reformer, the main purpose of which according to Bernard Porter was to “vindicate her father’s career”. She was an active contributor to many secularist periodicals including the National Reformer and author of many other books relating to secularism, blasphemy and freethinking.
In 1910, Bonner became the chairperson of the first secular peace society, the Rationalist Peace Society, which remained active throughout World War I, but fell into decline after peace was concluded.
She married Arthur Bonner in 1885 in Marylebone, London. They had two sons. She died at her London home on 25 August 1935 at age 77 after an abdominal operation for cancer.
Link to Wikipedia biography