Born at Lorch (Württemberg), Hafenreffer was professor at Tübingen from 1592 until his death in 1617. He was a motivating teacher with a charismatic influence upon his students. He combined strict faithfulness to the Book of Concord with a peaceful disposition. Among those who enjoyed his instruction and correspondence was the astronomer Johannes Kepler. His chief work was his system of doctrine under the title Loci Theologici (1600). He died in Tübingen, aged 58.