Educated at Christ Church College, Oxford, he became (1660) a lecturer there in Greek, rhetoric, and philosophy. He studied medicine, and his acquaintance with scientific practice had a strong influence upon his philosophical thought and method. In 1666, Locke met Anthony Ashley Cooper, the future 1st earl of Shaftesbury, and soon became his friend, physician, and adviser. After 1667, Locke had minor diplomatic and civil posts, most of them through Shaftesbury. In 1675, after Shaftesbury had lost his offices, Locke left England for France, where he met French leaders in science and philosophy.
Returning to England in 1679, he soon retired to Oxford, where he stayed quietly until, suspected of radicalism by the government, he went to Holland and remained there several years (1683–89). In Holland he completed the famous Essay Concerning Human Understanding (1690), which was published in complete form after his return to England at the accession of William and Mary to the English throne. In the same year he published his Two Treatises on Civil Government; part of this work justifies the Glorious Revolution of 1688, but much of it was written earlier. His fame increased, and he became known in England and on the Continent as the leading philosopher of freedom.
The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.