Johannes Kepler was a German astronomer, mathematician and astrologer, who discovered laws of planetary motion. His father was a mercenary (a soldier serving only for money). Johannes Kepler Biography. Johannes Kepler Biography Johannes Kepler was a famous German astronomer, mathematician and astrologer. He was the son of Heinrich and Katharina Guldenmann Kepler. Johannes Kepler was born on December 27, 1571, in the town of Weil der Stadt, which then lay in the Holy Roman Empire, and is now in Germany. Born in December 1571, in Weil der Stadt in Swabia, in southwest Germany, young Johannes Kepler was a sickly child of poor parents. Although a member of the Protestant faith, his father helped put down a Protestant uprising in the Low Countries (Belgium, Holland, and Luxembourg). Johannes Kepler was born on December 27, 1571, in Weil, Germany. Johannes Kepler, German astronomer who discovered three major laws of planetary motion. Read on to learn more about Johannes Kepler’s profile, childhood, life and timeline in … His mother, Katharina Guldenmann, was a herbalist who helped run an inn owned by her father. Johannes Kepler’s Early Life and Education. Kepler was a key figure in the Scientific Revolution of the 17th Century – confirming the theories of Copernicus and laying the foundation for Issac Newton to discover the laws of gravity. He also worked on optics, inventing an improved version of the refracting telescope. His discoveries turned Nicolaus Copernicus’s Sun-centered system into a dynamic universe, with the Sun actively pushing the planets around in noncircular orbits. Johannes Kepler was a german astronomer and mathematician, who is well-known for his approach to laws about the movement of planets in their orbit around the sun and for being an important figure in the scientific revolution.