1806-1873. English philosopher and economist who wrote On Liberty 1859, the classic philosophical defence of liberalism, and Utilitarianism 1863, a version of the `greatest happiness for the greatest number' principle in ethics. His progressive views inspired On the Subjection of Women 1869. In his social philosophy, he gradually abandoned the Utilitarians' extreme individualism for an outlook akin to liberal socialism, while still laying great emphasis on the liberty of the individual; this change can be traced in the later editions of Principles of Political Economy 1848. He was born in London, the son of James Mill. In 1822 he entered the East India Company, where he remained until retiring in 1858. In 1826, as described in his Autobiography 1873, he passed through a mental crisis; he found his father's bleakly intellectual Utilitarianism emotionally unsatisfying and abandoned it for a more human philosophy influenced by Coleridge. In Utilitarianism, he states that actions are right if they bring about happiness and wrong if they bring about the reverse of happiness. On Liberty moved away from the utilitarian notion that individual liberty was necessary for economic and governmental efficiency and advanced the classical defence of individual freedom as a value in itself and the mark of a mature society. He sat in Parliament as a Radical 1865-68 and introduced a motion for women's suffrage. His philosophical and political writings include A System of Logic 1843 and Considerations on Representative Government 1861.