Johannes Kepler was one of the leading astronomers of his time. Between 1609 and 1619 he published his Laws of Planetery Motion, describing the motion of the planets around the sun. However, Kepler war also a very religious man and hoped that his contribution to the progress of the natural sciences would help mankind to get a better unterstanding of God's creation.
Frederick Mackenzie (ca. 1787–1854), Portrait of Johannes Kepler (1571–1630), print, [date unknown]; source: Dibner Library of the History of Science and Technology, Smithsonian Institution Libraries, http://www.sil.si.edu/digitalcollections/hst/scientific-identity/CF/display_results.cfm?alpha_sort=k.