ocr: personality causes him to quarrel furiously with fellow scientists, such as the Englishman Robert Hooke (1635-1703), over his color theories, and the German mathematician GottiriedLeibniz (1646-1716), over who was the first to inyent calculus. 1695 Moves to London, where the English diarist Samuel Pepys (1633-1703) and the philosopher John Locke (1632-1704) are among his personal Iriends. 1696 Becomes Warden of the Mint (the government body responsible for making coins). His interest turns to
