 Third, studying the history of philosophy provides ample reasons to have some expertise in philosophy of religion. In the West, the majority of ancient, medieval, and modern philosophers philosophically reflected on matters of religious significance. Among these modern philosophers, it would be impossible to comprehensively engage their work without looking at their philosophical work on religious beliefs: René Descartes (1596–1650), Thomas Hobbes (1588–1679), Anne Conway (1631–1679), Baruch Spinoza (1632–1677), Margaret Cavendish (1623–1673), Gottfried Leibniz (1646–1716), John Locke (1632–1704), George Berkeley (1685–1753), David Hume (1711–1776), Immanuel Kant (1724–1804), and G.W.F. Hegel (1770–1831) (the list is partial). And in the twentieth century, one should make note of the important philosophical work by Continental philosophers on matters of religious significance: Martin Heidegger (1889–1976), Jean-Paul Sartre (1905–1980), Simone de Beauvoir (1908–1986), Albert Camus (1913–1960), Gabriel Marcel (1889–1973), Franz Rosenzweig (1886–1929), Martin Buber (1878–1956), Emmanuel Levinas (1906–1995), Simone Weil (1909–1943) and, more recently Jacques Derrida (1930–2004), Michel Foucault (1926–1984), and Luce Irigary (1930–). Evidence of philosophers taking religious matters seriously can also be found in cases of when thinkers who would not (normally) be classified as philosophers of religion have addressed religion, including A.N. Whitehead (1861–1947), Bertrand Russell (1872–1970), G.E. Moore (1873–1958), John Rawls (1921–2002), Bernard Williams (1929–2003), Hilary Putnam (1926–2016), Derek Parfit (1942–2017), Thomas Nagel (1937–), Jürgen Habermas (1929–), and others.